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GB 50688-2011 (GB50688-2011)

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GB 50688-2011: PDF in English
GB 50688-2011
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB 50688-2011
Code for Design of Urban Road Traffic Facility
ISSUED ON: MAY 12, 2011
IMPLEMENTED ON: MAY 1, 2011
Jointly issued by: Ministry of Housing and Urban-Rural Development of
the People's Republic of China;
General Administration of Quality Supervision,
Inspection and Quarantine of the People's Republic of
China.
Table of Contents
Foreword ... 4
1 General Provisions ... 9
2 Terms and Symbols ... 10
2.1 Terms ... 10
2.2 Symbols ... 12
2.3 Designation ... 13
3 Traffic Survey ... 14
4 Overall Design ... 15
4.1 General Requirements ... 15
4.2 Grading of Traffic Facility ... 15
4.3 Overall Design Requirements ... 16
4.4 Design Interface ... 17
5 Traffic Signs ... 19
5.1 General Requirements ... 19
5.2 Classification and Arrangement ... 19
5.3 Layout Design... 20
5.4 Material ... 22
5.5 Supporting Mode and Structure Design ... 23
6 Traffic Marking ... 24
6.1 General Requirements ... 24
6.2 Marking Arrangement ... 24
6.3 Material ... 26
6.4 Delineator ... 26
7 Protection Facilities ... 28
7.1 General Requirements ... 28
7.2 Crash Guardrail ... 28
7.3 Crash Cushion ... 32
7.4 Delimitation Structure of Collision Protection Facility ... 34
7.5 Pedestrian Guardrail ... 34
7.6 Separate Facility ... 36
7.7 Guard Fence and Anti-fall Net ... 37
7.8 Anti-glare Facility ... 38
7.9 Acoustic Barrier ... 38
8 Traffic Signal Lamp ... 39
8.1 General Requirements ... 39
8.2 Arrangement of Signal Lamp ... 39
8.3 Traffic Signal Control System ... 40
9 Traffic Surveillance and control System ... 41
9.1 General Requirements ... 41
9.2 Management Mode ... 42
9.3 Traffic Surveillance and control Center ... 42
9.4 Message Collection Facility ... 43
9.5 Message Display and Control Facility ... 43
9.6 Message Transmission Network ... 44
9.7 System Link and Safety ... 44
9.8 Main Performance Index of Surveillance and control System ... 45
9.9 Foundation and Piping of Out-field Equipment, Power Supply, Lightning Protection and
Earthing ... 45
9.10 Service Message Facility ... 46
9.11 Changeable Message Sign ... 46
10 Service Facility ... 48
10.1 General Requirements ... 48
10.2 Pedestrian Guide Facility ... 48
10.3 Pedestrian Crossing Facility ... 49
10.4 Parking Facility for Non-motor Vehicle ... 51
10.5 Parking Facilities for Motor Vehicle ... 52
10.6 Bus Stop ... 53
11 Road Lighting and Power Transformation and Distribution ... 56
11.1 Road Lighting ... 56
11.2 Lighting Control ... 59
11.3 Power Transformation and Distribution System ... 59
11.4 Energy Conservation ... 60
12 Management Office and Equipment ... 62
12.1 General Requirements ... 62
12.2 Management Office ... 62
12.3 Management Equipment ... 63
Explanation of Wording in This Code ... 64
List of Quoted Standards ... 65
1 General Provisions
1.0.1 With a view to maintaining order operation, security, smoothness and low
public nuisance of urban road traffic, unifying technical standards of urban road
traffic facility design, guiding engineering construction, and achieving
comprehensive function of urban road traffic facility, security and practical
advanced technology as well as economy and rationality, this code was
formulated.
1.0.2 This code is applicable to design of traffic facilities for constructed,
renovated and extended roads. Urban road traffic facilities shall include traffic
signs, traffic markings, protection facilities, traffic signal lamps, traffic
surveillance and control systems, service facilities, road lighting and power
transformation and distribution as well as management offices and equipment.
1.0.3 Urban road traffic facility shall be designed according to road nature,
environment along the line and traffic flow characteristics; and in addition, it
shall meet the requirements of relevant planning, overall design of road and
energy conservation and environmental protection in the project location area.
1.0.4 The overall dimensions and load of the design vehicle adopted in the
urban road traffic facility design shall meet the requirements of the current
national standard "Limits of Dimensions, Axle load and Masses for Road
Vehicles" (GB 1589).
1.0.5 The urban road traffic facility shall be designed synchronously with the
principal part of the road engineering; and the design is carried out according
to the principles of overall design and phased implementation. For the relevant
foundation engineering and piping of the principal part of the engineering, they
shall be reserved and embedded during implementation of the principal part of
the engineering.
1.0.6 The urban road traffic facility design shall meet the requirements of this
code as well as those specified in the current national standards.
2 Terms and Symbols
2.1 Terms
2.1.1 Right of way
Right of road user to carry out traffic activities in certain space at certain time
according to the requirements of traffic laws and regulations.
2.1.2 Warning sign
The sign used to warn the vehicles and pedestrians for noticing the road traffic.
2.1.3 Prohibition sign
The sign for prohibit or restrict traffic of vehicles and pedestrians.
2.1.4 Mandatory sign
The sign used to direct vehicles and pedestrians.
2.1.5 Guide sign
The sign used to deliver message on road direction, place and distance.
2.1.6 Changeable message sign
Changeable message sign can change its displayed content according to the
change of traffic, road and climate.
2.1.7 Active luminous sign
The sign with figures and symbols and can give out light from inside through
electric energy or other energy resources; under relatively dark environment, it
can be clearly identified.
2.1.8 Retro-reflection
The reflection which the reflecting light reflects from the opposite direction near
the opposite direction and returns to the light source.
2.1.9 Delineator
It is used for indicating heading direction of the road and the edge contour, and
is designed with retro-reflection characteristics or initiative lighting function.
2.1.10 Roadside clear zone
2.1.20 Delimitation structure
Major structure surrounding clearance of carriage way.
2.1.21 Collision protection facilities for main structure
Collision protection member enhanced on the major structure easy to be
collided.
2.1.22 Collision protection facilities for subsidiary structure
Collision protection facility arranged independently ahead of the major structure
easy to be collided for protecting the major structure.
2.1.23 Guard fence
Fence arranged for preventing pedestrians and non-motor vehicles from
entering into the expressway, ramp or other prohibited area.
2.1.24 Acoustic barrier
A specially designed acoustical baffle placed between the noise source and the
sound receiving point.
2.1.25 Traffic surveillance and control
A kind of technical measure for operation and management of road traffic
provided for the traffic manager through collection, treatment and launching of
traffic message.
2.2 Symbols
Eav - average illuminance
Emin - minimum illuminance
Evmin - minimum vertical illuminance
SR - surround ratio
TI - increase of glare limitation value
UE - uniformity of illuminance
UL - longitudinal uniformity of luminance
UO - overall uniformity of luminance
3 Traffic Survey
3.0.1 Traffic survey shall be carried out for urban road traffic facility design.
3.0.2 Traffic survey content shall cover the road network state in the location
area, the current state of land use along the line, the environment along the line,
the road and traffic conditions, the urban planning and the road network
planning. Except the design road itself, the surrounding area having effect on
the design road shall also be covered.
3.0.3 The following conditions shall be analyzed on the basis of investigation
and data collection in design of constructed road traffic facilities:
1 Social economy, traffic development, topography, climate and weather in
the located area of the project as well as the land development and utilization
conditions along the line of the project;
2 Relevant surrounding road grade, alignment, cross section arrangement
and traffic facility arrangement conditions;
3 Main road traffic characteristics, traffic organization and management
situation surround the project;
4 Status, function and road grade of the project in the planning of road
network;
5 Forecast traffic volume, traffic organization and traffic characteristics of
the project.
3.0.4 For design and investigation content of traffic facilities in renovated and
extended road engineering, except the information required by the new
engineering, the following contents shall also be supplemented in case of need:
1 Conditions of the existing road traffic facilities;
2 Conditions of the existing road traffic;
3.0.5 In renovation engineering design of road traffic facilities, the information
such as the existing geometric conditions of road, traffic volume, composition,
flow characteristics and accident shall be analyzed comprehensively; and
moreover, the predicted traffic information shall be analyzed and judged.
4 Overall Design
4.1 General Requirements
4.1.1 Overall design of the urban road traffic facility shall meet the requirements
of the overall objectives such as security, smoothness, environment protection
and sustainable development.
4.1.2 Overall design of the urban road traffic facility shall coordinate with the
design of the principal part of the road engineering, according to road function
and its function in the urban road network, the factors such as design, work,
maintenance, operation, management as well as short-term and long-term are
comprehensively considered so as to exactly embody the intention of the main
design for the road engineering.
4.1.3 Urban road traffic facilities shall not only maintain the respective
characteristics and relative independence, but also match and coordinate with
each other, so that they become a unified, coordinated and complete system
engineering.
4.2 Grading of Traffic Facility
4.2.1 Overall planning and design shall be carried out for urban road traffic
facility design according to the grade.
4.2.2 Grade of urban road traffic facility shall be divided into Grades A, B, C and
D, and shall meet the following requirements:
1 For Grade A facilities, signs, markings, isolation and protection facilities
with improved system shall be arranged; central separate crash guardrail and
necessary anti-glare facility must be arranged continuously in the central strip;
and crash guardrail must be arranged at roadside for bridge, high embankment
as well as road section with side road and side walk beside which may
endanger life and structure safety after crash; signs for guiding and prohibition
shall be arranged continuously for the grade-separated junction and the
surrounding road network; delineator shall be arranged continuously on both
sides of main road and ramp carriage way; branching triangle end at exit shall
be provided with eye-catching warning and collision protection facility; ramp
control signal lamp shall be arranged for actually controlled ramp; the traffic
surveillance and control system shall be arranged in accordance with Grade II;
and the medium-long, long and super-long tunnels shall be arranged in
accordance with Grade I;
2 For Grade B facilities, improved signs, markings, as well as necessary
isolation and isolation and protection facilities shall be arranged; road section
4.3.2 The interface and joint between the overall design and the principal part
of the engineering design shall be defined, and moreover, the specialized
design interface and joint of urban road traffic are coordinated so as to avoid
interference among facilities.
4.3.3 In the overall design, professional traffic facility design plan shall be
developed by organizing traffic facilities, the connection and assistance
between facilities are coordinated.
4.3.4 For the overall design, the road traffic facility design plan shall be
optimized and perfected according to the road service level of principal part of
the engineering design and security assessment conclusion.
4.3.5 Functional requirements on evacuation, salvage and rescue under special
traffic safety or emergency occasions shall be proposed in the overall design.
4.4 Design Interface
4.4.1 When traffic signs, delineators, protection facilities, traffic signal and
monitor system field equipment, lighting and power transformation and
distribution facilities are arranged on road structure or bridge, tunnel structure,
the designer of the traffic facilities shall provide the arrangement stake No.,
reserved hole size, structural gravity and load-carrying conditions; the design
of embedment and reserve shall be carried out by the designer of the principal
part of the engineering while he is designing the structure or bridge and tunnel
structure. The arrangement and installation of traffic facilities are designed by
the designer of traffic facilities.
4.4.2 When protection facilities with crash requirements are arranged on road
structure or bridge, tunnel structure, crash grade, geometric size and structure
design of collision protection facility as well as design for rigid-soft collision
protection transition section at structure end shall be provided with by the
designer of traffic facilities; the designer of the principal part of the engineering
shall carry out the design of road structure or bridge and tunnel structure.
4.4.3 Communication and signal system piping embedded in road subgrade
cross section shall be determined by the designers of traffic facilities and
principal part of the engineering and layout position of the piping is determined
by the design of the traffic facility designer; the principal part of the engineering
designer shall indicate the sizes and positions of reserved piping, manhole and
tube-box in the relevant design drawing, and they shall be listed in the design
document of the principal part of the engineering.
4.4.4 Service facilities such as taxicab, bus station, pedestrian crossing facility
are covered in the design of principal part of the engineering, and their positions,
scales and sizes shall be proposed by the traffic facility designer, after
5 Traffic Signs
5.1 General Requirements
5.1.1 Design of traffic signs shall be in accordance with the relevant laws and
regulations of road traffic management and traffic organization management
plans, and concisely and accurately deliver message such as right of way, rules
of road as well as route indication to road users; and guarantee traffic
smoothness and travel safety.
5.1.2 Message delivered by other management facilities such as traffic signs
and traffic markings shall be consistent and supplement each other.
5.1.3 Traffic signs shall not deliver message irrelevant with road traffic.
5.1.4 Mandatory signs for emergency, fire protection and risk prevention in
tunnel shall be active luminous signs or illuminated signs.
5.1.5 Traffic signs shall not intrude into delimitation of road construction.
5.2 Classification and Arrangement
5.2.1 According to the function, traffic signs shall be divided into main one and
auxiliary one, the former one covers warning sign, prohibition sign, mandatory
sign, guide sign, tourist area sign, operating area sign and announcement sign;
the auxiliary sign is attached under the latter one for giving auxiliary description.
5.2.2 According to the display mode of layout content, traffic signs shall be
divided into static ones and changeable message ones.
5.2.3 Arrangement of traffic signs shall meet the following requirements:
1 Factors such as urban scale, characteristics, road network facility layout,
road grade, geometric conditions, traffic conditions, road user demands,
environment and climate shall be considered comprehensively;
2 Traffic laws and safety requirements shall come first in arrangement of
signs;
3 Message display of sign shall be explicit, continuous and systematic, the
phenomena of insufficient or overloading message shall be avoided; and what's
more, important message shall be displayed in repetition;
4 Under dynamic condition, legibility of road user shall be given full
consideration, namely the time and advance range necessary for users to find
and read signs and then take action under that condition;
5.4.2 Grades 1 ~ 3 reflective films shall be adopted for signs on urban
expressway and urban arterial road; and on curve section or other danger road
sections, reflective film above Grade 2 is adopted. Reflective film above Grade
4 shall be adopted for signs on urban secondary trunk road and roads of lower
grade.
5.4.3 Underplate and supporting structure of sign should be made of light
material and structure, and meet the requirements of strength, rigidity, durability
and corrosion resistance.
5.4.4 Display mode and material for board of changeable message sign shall
be selected according to requirements of type, content displayed, control mode,
environmental protection and energy conservation on signs.
5.5 Supporting Mode and Structure Design
5.5.1 According to requirements of importance of message that the sign
delivers, layout size, traffic volume lane number, designed wind speed,
roadside conditions and suspension position, sign board may be adopted with
supporting modes such as column type, cantilever type, frame type or adhesion
type.
5.5.2 Design for supporting structure of sign shall be sorted according to
supporting mode and board surface size of the sign. The upper structure, post,
transom and the connection are designed, and moreover, the deformation and
strength are calculated and checked respectively; for the substructure, its
design of strength, overturning resistance and anti-sliding are calculated and
checked, so is the base stress.
5.5.3 In wind load calculation, the designed wind speed shall meet the following
requirements:
1 The 50-year 10 min calculated mean maximum wind speed at place 10
m higher than the flat open area in the location area of the sign shall be adopted;
2 When it is lack of observation data of wind speed, the designed wind
speed may be in accordance with the "profile for the National reference wind
speed and the reference wind speed", the speed will be adopted after
verification in field survey; however, it shall be not less than 22 m/s.
3 Connection between the sign board and the supporting structure shall be
firm and reliable with convenient installation, flat and smooth board surface and
easy maintenance.
6 Traffic Marking
6.1 General Requirements
6.1.1 Marking shall meet the functional requirements of road usage, and deliver
relevant rule, warning and guideline to road users.
6.1.2 Marking may be used in conjunction with the sign or used exclusively.
6.1.3 Marking shall be able to be identified clearly, and meet the requirements
of legibility in daytime, rain day and nighttime. Urban expressway and arterial
road shall be arranged with reflective traffic markings.
6.2 Marking Arrangement
6.2.1 Traffic markings of general road section of monitor shall meet the following
requirements:
1 For urban motor vehicle road of two-way traffic, yellow divisional line for
carriage way of opposite direction shall be drawn between lanes for driving of
opposite direction;
2 For urban expressway, carriage way edge line shall be drawn at outer
side edge (inner side of marginal strip) of motor lane; for road of other grades,
carriage way edge line should be drawn at the outer side edge (inner side of
the marginal strip) of the motor lane;
3 For road section on which motor vehicle and non-motor vehicle travel
separately, carriage way edge line (divisional line of motor vehicle and non-
motor vehicle) shall be drawn at the division of motor vehicle lane and non-
motor vehicle lane;
4 Arrangement of crosswalk line shall be determined according to the
factors such as road grade, pedestrian traversing demands and traffic safety;
5 Marking width shall be determined according to road grade, design speed
and width of pavement, and moreover, it shall meet the requirements specified
in Table 6.2.1.
turning is equipped with and accommodation lane for left-turning is provided
with; however, it shall not hinder the normal straight traveling of vehicle at the
opposite direction.
3 On occasions that the at-grade intersection is overlarge and irregular and
the traffic organization is complex, and when it is hard for vehicles to find exit
lanes, guide line shall be arranged at the junction to assist traveling and turning
of vehicles.
4 For over wide and irregular junction or with relatively complex traveling
conditions, ramp entrance or other special place of grade-separated junction,
guide line shall be arranged, and it shall be designed according to topography,
traffic flow and the flow direction at the junction.
5 Entrance/exit marking and guide arrow shall be arranged for branch
section and merging section of grade-separated junction. Arranged size and
repeated arranged time of guide arrow shall be selected according to those
specified in Table 6.2.3. For junction with irregular turning order at entrance lane,
repeated arranged time of the guide arrow should be increased.
Table 6.2.3 -- Arranged Size and Repeated Arranged Time of Guide Arrow
at Entrance/Exit
Design speed (km/h) 100 80, 60, 50 40, 30, 20
Length of guide arrow (m) 9 6 3
Repeated arranged time ≥ 3 3 ≥ 2
6.3 Material
6.3.1 The material shall be durable, abrasion and corrosion resistant, and
strongly bonded with the pavement, and moreover, be equipped with favorable
identification and anti-slip performance.
6.3.2 Urban expressway and arterial road shall be adopted with reflective
marking. Luminance factor of white reflective marking paints shall be greater
than or equal to 0.35, and their initial retro-reflection coefficient shall be greater
than or equal to 150 mcd • 1x-1 • m-2; that of yellow ones shall be greater than
or equal to 0.27 and their initial retro-reflection coefficient shall be greater than
or equal to 100 mcd • 1x-1 • m-2.
6.3.3 Marking shall be adopted with environmental protection material, and it
shall not pollute the surrounding environment and harm the construction
personnel.
6.4 Delineator
6.4.1 Arrangement of delineator shall meet the following requirements:
7 Protection Facilities
7.1 General Requirements
7.1.1 Protection facilities shall be adopted with environmental protection
material and convenient for installation and repair.
7.1.2 Protection facilities shall not intrude into delimitation of road
construction as well as the range of stopping sight distance.
7.1.3 For expressway roadside which is not provided with sufficient clear
distance, crash guardrail must be arranged; where width for integral
cross-section central strip of subgrade is less than or equal to 12 m, crash
guardrail must be arranged continuously for median divider of
expressway.
7.1.4 Protection facilities should be concise and generous and coordinate with
design style of road, bridge and surrounding building.
7.2 Crash Guardrail
7.2.1 Crash grade and key technical indexes of crash guardrail shall be in
accordance with those specified in Table 7.2.1.
Table 7.2.1 -- Crash Grade and Key Technical Indexes of Crash Guardrail
Crash grade Crash condition
Roadside
guardrail
Median
barrier Crash vehicle
Vehicle
mass (t)
Crash speed
(km/h)
Crash
angle (°)
Crash
energy (kJ)
B Bm
Small
passenger
car
1.5 80 20 —
Large
passenger
car
10 40 20 70
A Am
Small
passenger
car
1.5 100 20 —
Large
passenger
car
10 60 20 160
SB SBm
Small
passenger
car
1.5 100 20 —
2 Roadside of arterial road should be arranged with crash guardrail. Crash
grade of roadside guardrail on the arterial road shall meet the requirements of
Table 7.2.4-2;
Table 7.2.4-2 -- Application Conditions for Crash Grade of Arterial Road
Roadside Guardrail
Application conditions Design speed (km/h) 60, 50 40
General road section and ramp B —
High slope, bridge approach, connecting line of tunnel opening and road
section near structure A B
High steep slope, high retaining wall, road section near river and that on which
severe accident may take place when vehicle runs out of it. SB A
Road section near adjacent to other expressway and people flow concentrated
area and that on which severe secondary accident may take place when
vehicle runs out of it.
SA SB
3 Roadsides of secondary trunk road and branch road are generally not
arranged with roadside guardrail. For road section on which severe accident or
severe secondary accident may take place when vehicle runs out of it, crash
guardrail should be arranged. Crash grade for crash guardrails on roadsides of
secondary trunk road and branch road is arranged by reference to the arterial
road.
4 For road sections such as trunk line railway, reservoir, oil depot, power
plant which require special protection, their crash guardrails shall be specially
designed.
7.2.5 Arrangement of median barrier shall meet the following requirements:
1 Crash grade of expressway median barrier shall meet the requirements
of Table 7.2.5-1;
Table 7.2.4-1 -- Application Conditions for Crash grade of Expressway
Median Barrier
Application conditions Design speed (km/h) 100 80 60
General road section SBm Am Bm
Particularly protected road section such as ramp turn with small radius,
median divider with pier and other structure SAm SBm Am
2 Median divider of arterial road whose design speed is greater than or
equal to 50km/h should be arranged with crash guardrail. Crash grade of the
median barrier on the arterial road shall meet the requirements of Table 7.2.5-
2.
to secondary trunk road, branch road or people flow concentrated
area.
Height of the bridge is greater than 20 m, or the bridge crosses
or is adjacent to arterial road or expressway. SS SA SB
3 Crash grade for guardrail of secondary trunk road, branch road bridge
and culvert may be selected according to the criteria of arterial road with 40km/h
design speed in Table 7.2.7.
4 For road sections which are adjacent to or cross trunk line railway,
reservoir, oil depot, power plant and require special protection, their bridge
guardrail shall be specially designed and reasonable crash condition shall be
determined;
5 Small bridge, culvert and channel of expressway and arterial road shall
be arranged with crash guardrail with type the same as that of the subgrade
section.
7.2.8 Safety treatment shall be carried out for the beginning and ending of the
crash guardrail.
7.2.9 Transition section shall be arranged for conjunction of crash guardrail with
crash guardrails of different structure types or rigidity, so that rigidity of guardrail
can transit gradually thus forming an integrity.
7.3 Crash Cushion
7.3.1 Crash grade of crash cushion shall be divided into 3 grades, and the key
technical indexes for each grade shall be in accordance with those specified in
Table 7.3.1.
Table 7.3.1 -- Crash Grade of Crash Cushion
Crash cushion type Crash grade
Crash condition
Crash
type Crash vehicle
Crash
mass
(t)
Crash
speed
(km/h)
Crash
angle
(°)
Non-redirective crash
cushion
B50
Direct
crash Small
passenger car 1.5 50
Oblique
crash 15
B65
Direct
crash Small
passenger car 1.5 65
Oblique
crash 15
7.4 Delimitation Structure of Collision Protection Facility
7.4.1 During traveling, it is easy for vehicle to run out of the delimitation to
collide on the bridge pier stud, main beam, both ends and top of tunnel opening
entrance, as well as traffic sign supporting structure, therefore, delimitation
facility shall be arranged at the delimitation structure.
7.4.2 For collision protection of delimitation structure at top side of the road,
collision protection facilities such as crash cushion, crash island, crash bearer
and those for strengthening collision protection of pier stud may be arranged
before the road; for that of delimitation structure at side face, crash guardrail
may be arranged and strengthened at the roadside; and that of delimitation
structure at the top surface, collision protection structure and warning and
delimitation signs may be arranged.
7.4.3 When position of combined or concrete wall crash guardrail arranged at
the roadside overlaps with that of the delimitation structure, if the delimitation
structure itself can meet the crash requirements, integral delimitation structure
collision protection which is constructed through combining delimitation
structure may be adopted, and moreover, the section shape of the crash side
is consistent with the original crash guardrail.
7.4.4 Corrugated beam as crash guardrail is arranged at roadside, where
deformation of the corrugated beam fails to meet the requirements for
protecting the delimitation structures on both sides, guardrail post with densed
spacing or crash guardrail facility with level higher than Grade SB of highway.
7.4.5 When no delimitation structure of crash guardrail is arranged at side face
of road, crash cushion, crash island and crash bearer should be arranged at
the front crash side.
7.4.6 Delimitation collision protection at top surface may be adopted with
collision protection facilities for main structure, auxiliary collision protection
facility and warning sign as well as delimitation sign.
7.4.7 Design for collision protection facility of delimitation structure shall be in
accordance with the principles of security, economy, duration and be
convenient for maintenance, the appearance shall be concise, and
simultaneously, warning marks which are consistent with the design style of the
road, bridge...
......
(Above excerpt was released on 2019-05-03, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GB50688-2011