GB 5768.5-2017 PDF English
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GB 5768.5-2017: Road traffic signs and markings - Part 5: Speed limit---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB5768.5-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 03.220.20
R 80
Partially replacing GB 5768-1999
Road traffic signs and markings - Part 5.Speed limit
Issued on. JULY 31, 2017
Implemented on. FEBRUARY 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 4
4 General provisions... 5
5 Determination of speed limit value... 5
6 Setting of speed limit sign... 6
7 Setting of variable speed limit sign... 10
8 Setting of speed limit sign of pavement... 11
Appendix A (Informative) Factors for determining speed limit... 12
Appendix B (Informative) Example for determining the 85%th speed and step
... 13
Appendix C (Informative) Minimum length of speed limit zone... 16
Foreword
All technical contents of this part of GB 5768 are mandatory.
GB 5768 “Road traffic signs and markings” is divided into eight parts.
- Part 1.General;
- Part 2.Road traffic signs;
- Part 3.Road traffic markings;
- Part 4.Work zone;
- Part 5.Speed limit;
- Part 6.Highway railway grade crossing;
- Part 7.Non-motorized vehicles and pedestrians;
- Part 8.School area.
This part is the part 5 of GB 5768.
This part was drafted in accordance with the rules given in GB/T 1.1-2009.
This part was proposed by the Ministry of Transport of the People’s Republic of
China.
This part shall under the jurisdiction of the National Traffic Engineering Facilities
(Highway) Standardization Technical Committee (SAC/TC 223).
Drafting organization of this part. Highway Science Research Institute of the
Ministry of Transport.
The main drafters of this part. Tang Zhengzheng, Liu Xingwang, He Yong, Gao
Hailong, Zhang Fan, Wu Jingmei, Wang Dan, Guo Yan.
This standard replaces the standard previously issued as follows.
- GB 5768-1986, GB 5768-1999.
Road traffic signs and markings - Part 5.Speed limit
1 Scope
This part of GB 5768 specifies the general requirements and use of speed limit
for road traffic signs and markings.
This part applies to the setting of the speed limit signs and markings on all kinds
of roads including highway, urban roads, places which is under the jurisdiction
of the unit but allows social vehicles to pass, squares, public parking lots, other
places which are used for public access. The speed limit signs and markings
which are set in other places where motor vehicles pass, parking lots, etc. can
make reference to this standard.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB 5768.2-2009 Road traffic signs and markings - Part 2.Road traffic signs
GB 5768.3 Road traffic signs and markings - Part 3.Road traffic markings
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Speed limit
The maximum speed at which a motor vehicle is allowed to travel on a
specific segment of the road.
3.2
Design speed
The speed which is used in the geometric design of the road.
3.4
Advisory speed
The drive speed of a vehicle as recommended for a road segment according
to the design, traffic characteristics and environmental conditions of the road.
3.5
Speed zone
A road segment or a road network to which a certain speed limit sign applies.
4 General provisions
4.1 The speed limit sign shall be set at the starting point where the speed
change is limited.
4.2 The speed limit value on the speed limit sign shall be the speed limit which
is specified by laws and regulations, or the speed limit which is demonstrated
by traffic engineering and approved by the competent authority.
4.4 At a specific location, after analysis and demonstration, it may use the
recommended speed sign below the limit speed value, together with the
relevant warning signs, to remind the driver to decelerate.
5 Determination of speed limit value
5.1 Consider road function, operating speed, road environment, historical
accidents, etc., as shown in Appendix A.
5.2 The speed limit value is based on the design speed value of the road, it may
take the design speed value or the value less than the design speed. Under the
premise of complying with the law, the speed limit value can also be increased
by 10 km/h ~ 20 km/h, but not higher than 120 km/h.
5.3 Observe or predict some representative sections in the speed limit zone, to
determine the 85%th speed, as shown in Appendix B. Based on the 85%th speed
value, take the value in the range 5 km/h ~ 10 km/h above and below it. When
selecting the representative section, it shall avoid the influence of the
intersection under the signal control.
5.6 In the road segment where the environment is complex and there is lateral
interference, the limit speed should not be higher than the design speed.
5.7 The speed limit value is an integral multiple of 10 km/h.
5.8 When the road function or environment changes greatly, it should evaluate
the speed limit value and adjust the speed limit value as needed.
5.9 See Appendix C for the minimum length of the speed limit zone.
6 Setting of speed limit sign
6.1 The speed limit sign should be set at the starting point of the speed limit
zone.
6.2 It can be set repeatedly at such positions at the entry and behind the level
crossing of the expressway, the primary road as the trunk line, the urban
highway, or the positions where the driver needs to be reminded.
6.5 For the road of 3 lanes and above in the same direction, it should set the
speed limit signs on both sides at the same time, or otherwise set the speed
limit sign above the lane. The setting of the speed limit sign shall take into
account the factors such as vehicle occlusion and viewing angle.
6.6 An example of the speed limit signs for different vehicle types are as shown
in Figure 2.
6.7 For the speed limit for different lanes, the speed limit sign should be set
directly above the lane. An example is as shown in Figure 3.
6.12 The regional speed limit sign (forbidden sign 44 of GB 5768.2-2009) faces
the vehicle leaving the area, which is convenient for observation by the vehicles
driving away.
7 Setting of variable speed limit sign
7.1 According to the requirements below, when the conditions permit, it may set
the variable speed limit sign.
7.2 The digital form and color of the variable speed limit sign shall comply with
the requirements of GB 5768.2-2009 for speed limit signs and variable
information signs.
7.3 The variable speed limit sign is displayed with reference to the variable
speed limit sign.
8 Setting of speed limit sign of pavement
8.1 Where the road conditions permit, it may set the speed limit mark of
pavement close to the speed limit sign as required.
8.3 The speed limit sign set shall meet the requirements of GB 5768.3.
Appendix A
(Informative)
Factors for determining speed limit
A.1 Road function
The determined speed limit shall be reasonable and consistent with the road
function.
A.2 Driving speed
Determining the speed limit shall take into account the driving speed, which
usually uses the 85%th speed. See Appendix B for the method of determining
the 85%th speed.
A.3 Road environment
A.3.1 The road environment includes roadside development level, road
characteristics, traffic characteristics.
A.3.4 Traffic characteristics mainly include traffic flow and traffic composition.
The traffic composition includes non-motorized traffic.
A.4 Historical accident
When the speed limit which is determined considering A.1, A.2, A.3 is
inconsistent, it may consider the historical incidents.
If a historical accident indicates that the accident is frequent, it indicates that it
should take comprehensive improvement measures, instead of merely
changing the speed limit.
Appendix B
(Informative)
Example for determining the 85%th speed and step
B.1 Data collection
B.1.1 When collecting speed data, it shall meet the conditions in Table B.1.
B.1.2 Sample size
According to the estimated speed limit of the survey site, the minimum sample
size is as shown in Table B.2.
B.2 Data analysis
B.2.1 The calculation of the 85%th speed for each survey point can be
determined by the speed cumulative frequency curve. As shown in Figure B.1,
the speed corresponding to the cumulative frequency of 85% on the curve is
the 85%th speed.
Figure B.1 -- Example of determining the cumulative frequency curve for
the 85%th speed
B.3 Results of data analysis
B.3.1 The ideal speed distribution has the following characteristics.
B.3.2 If the speed distribution does not meet the requirements of B.3.1, it may
be a problem with data collection, or it may be that the driver’s perception of the
road environment (expressed as speed) is inconsistent with the road
environment. In the latter case, it should take other measures, to solve the
problem of inconsistency between speed and road environment. Then perform
the analysis of speed distribution.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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