GB/T 41920-2022Specification for urban bus and trolleybus performance evaluation (English PDF)
城市公共汽电车运行状况评价规范
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
October 12, 2022
Implementation date
October 12, 2022
Scope
GB/T 41920-2022 is the English-translated version of 城市公共汽电车运行状况评价规范.
GB/T 41920-2022 sets out how the running performance of an urban bus and trolleybus network is measured and graded. It fixes the evaluation objects and procedure, the indicators and their formulas, the data requirements, the performance classification and the evaluation results.
The indicators are average travel speed for the route network, a network road, a route and a route link, the ratio of bus travel speed to free-flow speed and to car travel speed, and a dimensionless performance index; free-flow speed is taken as the 90th percentile of the time-interval means, with sample days numbering no less than 30.
It also fixes the geographic, vehicle positioning, electronic schedule and road traffic flow data needed, and grades performance as free-flow, basically free-flow, delayed or congested. Issued on 12 October 2022, it has applied since the same date.
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Document preview — GB/T 41920-2022
National Standard of the People's Republic of China
- ICS
- 03.220.20
- Classification
- R 11
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope4
- 2 Normative References4
- 3 Terms and Definitions4
- 4 Evaluation Objects and Process6
- 5. Evaluation Index and Calculation Method6
- 6 Data Requirements10
- 7 Classification of Urban Bus and Trolleybus Performance11
- 8 Evaluation Results12
- Appendix A (Normative) Calculation Method and Procedures of Urban Bus and Trolleybus Free-Flow Speed13
- Appendix B (Normative) Tristimulus Value X, Y, Z Comparison List of Color Expression of Urban Bus and Trolleybus Performance Level14
- Bibliography15
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:
VR - in the evaluation period, the average travel speed of the evaluated bus and trolleybus route network, 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;
M - in the evaluation period, the number of bus and trolleybus routes in the evaluated bus and trolleybus route network; sij - 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 - 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:
V r - 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 - 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:
VL- in the evaluation period, the average travel speed of the evaluated bus and trolleybus route, in km/h;
N - in the evaluation period, the number of buses and trolleybuses running in the evaluated bus and trolleybus route; sj - 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 - 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:
Vt - 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.
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;
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 - 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 V 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:
V t - in the tth time interval, the arithmetic mean of the average travel speed of bus and trolleybus, in km/h;
Vm - in the tth time interval, average travel speed of bus and trolleybus of the nth sample, in km/h; n - the sample days.
c) The calculated arithmetic mean V t of the average travel speed of bus and trolleybus in each time interval shall be sorted from small to large; and the gammath percentile of the sorting results is taken as bus and trolley bus free-flow speed Vf, and the specific value of gamma 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. […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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Related Standards
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