GB/T 41920-2022 PDF in English
GB/T 41920-2022 (GB/T41920-2022, GBT 41920-2022, GBT41920-2022)
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Specification for urban bus and trolleybus performance evaluation
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Standards related to (historical): GB/T 41920-2022
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GB/T 41920-2022: PDF in English (GBT 41920-2022) GB/T 41920-2022
GB
NATIONAL STANDARD OF THE
PEOPLEβS REPUBLIC OF CHINA
ICS 03.220.20
CCS R 11
Specification for Urban Bus and Trolleybus Performance
Evaluation
ISSUED ON: OCTOBER 12, 2022
IMPLEMENTED ON: OCTOBER 12, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the Peopleβs Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 4
4 Evaluation Objects and Process ... 6
5. Evaluation Index and Calculation Method ... 6
6 Data Requirements ... 10
7 Classification of Urban Bus and Trolleybus Performance ... 11
8 Evaluation Results ... 12
Appendix A (Normative) Calculation Method and Procedures of Urban Bus and
Trolleybus Free-Flow Speed ... 13
Appendix B (Normative) Tristimulus Value X, Y, Z Comparison List of Color
Expression of Urban Bus and Trolleybus Performance Level ... 14
Bibliography ... 15
Specification for Urban Bus and Trolleybus Performance
Evaluation
1 Scope
This Document stipulates the evaluation objects and procedures, evaluation indicators and
calculation methods, data requirements, classification and evaluation results of the urban bus
and trolleybus performance.
This Document is applicable to the monitoring and evaluation of the urban bus and trolleybus
performance.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in 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) is applicable to this Document.
GB/T 3977 Methods of Color Specification
GB/T 33171 Specification for Urban Traffic Performance Evaluation
3 Terms and Definitions
For the purposes of this Document, the terms and definitions given in GB/T 33171 and the
following apply.
3.1 Urban bus and trolleybus performance
The transportation speed of urban bus and trolleybus in the urban bus and trolleybus route
network.
3.2 Travel time
The time it takes for a motor vehicle to pass between two endpoints of a road segment.
3.3 Bus and trolleybus travel speed
The average speed of the distance traveled by bus and trolleybus divided by the travel time.
NOTE: The unit is kilometers per hour (km/h).
3.4 Travel speed
The average speed of a motor vehicle passing between two endpoints of a road segment.
3.5 Bus and trolleybus route network
A network that is composed of roads equipped with bus and trolleybus route within a certain
area.
3.6 Bus and trolleybus route network road
A directional road segment within a bus and trolleybus route network.
3.7 Bus and trolleybus route
The road that the bus and trolleybus run along fixed routes and stations.
3.8 Bus and trolleybus route link
The directional section on the bus and trolleybus route, which generally takes two bus and
trolleybus stops as endpoints.
3.9 Bus and trolleybus free-flow speed
The average transport speed when the traffic flow density approaches zero and the bus and
trolleybus can travel freely without being disturbed by other vehicles.
3.10 Electronic schedule
The data of shift operation of the bus and trolleybus that are recorded through intelligent
dispatching and other information systems.
3.11 The ratio of bus and trolleybus travel speed to free-flow speed
The ratio of bus and trolleybus travel speed to free-flow speed.
3.12 Bus and trolleybus performance index
A dimensionless value that reflects the performance of the bus and trolleybus route network,
the route network road, the route and the route link.
5.1.1 Average travel speed of bus and trolleybus route network
The calculation method of the average travel speed of the bus and trolleybus route network is
shown in the Formula (1)
Where:
πΰ΄€R β in the evaluation period, the average travel speed of the evaluated bus and trolleybus route
network, in km/h;
N β in the evaluation period, the number of buses and trolleybuses running on bus and trolleybus
route i in the evaluated bus and trolleybus route network;
M β in the evaluation period, the number of bus and trolleybus routes in the evaluated bus and
trolleybus route network;
sij β in the evaluation period, the driving range of the bus and trolleybus vehicle j operating on
the bus and trolleybus route i in the evaluated bus and trolleybus route network, in km;
tij β in the evaluation period, the driving time of the bus and trolleybus vehicle j operating on
the bus and trolleybus route i in the evaluated bus and trolleybus route network, in h.
The calculation time of the average travel speed of the bus and trolleybus route network based
on historical data should take 15 min, hours, peak hours, days, weeks, months, seasons, years,
etc.
The calculation time of the average travel speed of the bus and trolleybus route network based
on real-time data shall not exceed 15 min.
5.1.2 Average travel speed of bus and trolleybus route network road
See Formula (2) for the calculation method of the average travel speed of the the bus and
trolleybus route network road.
Where:
πΰ΄€ r β in the evaluation period, the average travel speed of the evaluated bus and trolleybus route
network road, in km/h;
n - in the evaluation period, the number of buses and trolleybuses running on bus and trolleybus
route i in the evaluated bus and trolleybus route network road;
m β in the evaluation period, the number of bus and trolleybus routes in the evaluated bus and
trolleybus route network road.
The calculation time of the average travel speed of the bus and trolleybus route network road
based on historical data should take 15 min, hours, peak hours, days, weeks, months, seasons,
years, etc.
The calculation time of the average travel speed of the bus and trolleybus route network road
based on real-time data shall not exceed 15 min.
5.1.3 Average travel speed of bus and trolleybus route
See Formula (3) for the calculation method of the average travel speed of the bus and trolleybus
route.
Where:
πΰ΄€Lβ in the evaluation period, the average travel speed of the evaluated bus and trolleybus route,
in km/h;
N β in the evaluation period, the number of buses and trolleybuses running in the evaluated bus
and trolleybus route;
sj β in the evaluation period, the driving range of the bus and trolleybus vehicle j running in the
evaluated bus and trolleybus route, in km;
tj β in the evaluation period, the driving time of the bus and trolleybus vehicle j running in the
evaluated bus and trolleybus route, in h.
The calculation time of the average travel speed of the bus and trolleybus route based on
historical data should take 15 min, hours, peak hours, days, weeks, months, seasons, years, etc.
The calculation time of the average travel speed of the bus and trolleybus route based on real-
time data shall not exceed 15 min.
5.1.4 Average travel speed of bus and trolleybus route link
See Formula (4) for the calculation method of the average travel speed of bus and trolleybus
route link.
5.2.2 The ratio of bus and trolleybus travel speed to car travel speed
See Formula (6) for the calculation method of the ratio of bus and trolleybus travel speed to car
travel speed.
Where:
RBC - in the evaluation period, the ratio of bus and trolleybus travel speed to car travel speed in
the evaluated bus and trolleybus route network, route network road, route and route link;
Vt β in the evaluation period, average travel speed of car in the evaluated bus and trolleybus
route network, route network road, route and route link, in km/h.
The calculation time of the ratio of bus and trolleybus travel speed to car travel speed based on
historical data should take 15 min, hours, peak hours, days, weeks, months, seasons, years, etc.
The calculation time of the ratio of bus and trolleybus travel speed to car travel speed based on
real-time data shall not exceed 15 min.
5.3 Comprehensive indexes and calculation methods
The bus and trolleybus performance index is calculated based on the ratio index of bus and
trolleybus travel speed to free-flow speed; and the calculation method is shown in Formula (7).
Where:
IBP β in the evaluation period, the bus and trolleybus performance index in the evaluated bus
and trolleybus route network, route network road, route and route link.
The calculation time of the bus and trolleybus performance index based on historical data
should take 15 min, hours, peak hours, days, weeks, months, seasons, years, etc.
The calculation time of the bus and trolleybus performance index based on real-time data shall
not exceed 15 min.
6 Data Requirements
6.1 Geographic information data
6.1.1 The site data shall at least include the site number, name, type, latitude and longitude, and
area information.
6.1.2 Road data shall at least include the number, length, direction, area name, and road name
information.
6.1.3 Route data shall at least include route number, name, length, uplink and downlink
directions, and station sequence information.
6.1.4 Area data shall at least include area number and name information.
6.2 Bus and trolleybus positioning data
The bus and trolleybus positioning data shall be able to describe the vehicle movement
trajectory; and shall at least include route number, vehicle number, latitude and longitude, route
link, driving direction, speed, and time stamp information; and the data sampling interval shall
not exceed 30s.
6.3 Bus and trolleybus electronic schedule
The bus and trolleybus electronic schedule shall be able to describe the historical operation of
the vehicles; and shall at least include the route number, vehicle number, departure time, and
arrival time information.
6.4 Road traffic flow performance data
Road traffic flow performance data shall be able to describe the actual performance of cars on
the road; and shall at least include the road number, area name, road name, direction, average
travel time of the road, average travel speed and traffic flow information.
7 Classification of Urban Bus and Trolleybus Performance
The urban bus and trolleybus performance is classified into four levels according to the
performance index of buses and trolleybus: free-flow, basically free-flow, delayed, and
congested. The classification shall comply with the provisions of Table 1; the color expression
shall comply with the provisions of Appendix B.
Appendix A
(Normative)
Calculation Method and Procedures of Urban Bus and
Trolleybus Free-Flow Speed
The urban bus and trolleybus free-flow speed Vf shall be calculated according to the following
procedures.
a) The urban bus and trolleybus performance period shall be equally divided according to a
given time interval; and the length of the time interval shall not exceed 15 min.
b) Calculate the arithmetic mean πΰ΄€ t of the average travel speed of bus and trolleybus in each
time interval; and the number of sample days shall be no less than 30d. See Formula (A.1)
for the calculation method of the arithmetic mean of the average travel speed of bus and
trolleybus:
Where:
πΰ΄€ t β in the tth time interval, the arithmetic mean of the average travel speed of bus and
trolleybus, in km/h;
πΰ΄€m β in the tth time interval, average travel speed of bus and trolleybus of the nth sample,
in km/h;
n β the sample days.
c) The calculated arithmetic mean πΰ΄€ t of the average travel speed of bus and trolleybus in
each time interval shall be sorted from small to large; and the Ξ³th percentile of the sorting
results is taken as bus and trolley bus free-flow speed Vf, and the specific value of Ξ³ can
be adjusted according to the actual situation, generally take 90.
When the calculated bus and trolleybus free-flow speed exceeds the road speed limit, the road
speed limit value shall be taken.
NOTE: The bus and trolleybus free-flow speed needs to be regularly updated in conjunction with the
level of urban traffic development.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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