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GB 5768.5-2017 English PDF (GB5768.5-2017)

GB 5768.5-2017 English PDF (GB5768.5-2017)

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GB 5768.5-2017: Road traffic signs and markings -- Part 5: Speed limit

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.
GB 5768.5-2017
GB
NATIONAL STANDARD OF THE
PEOPLE 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 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 GB 5768.4 Road traffic signs and markings - Part 4. Work zone
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.
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. If the speed limit value is 10 km/h ~ 20 km/h higher than the design speed value, it shall be subjected to traffic engineering demonstration.
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.
5.4 If the difference between 5.2 and 5.3 exceeds 20 km/h, it requires further analysis, observation or prediction, adjustment.
5.5 For the long-large structures such as cross-sea bridges, extra-long tunnels, mountain high-rise large bridges, etc., the speed limit shall not be higher than the design speed.
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.
6.3 The speed limit sign should be set separately. Except for the minimum speed limit sign (see Example 16 of GB 5768.2-2009) or auxiliary signs, it is not advisable to attach other signs on the post of speed limit sign.
6.4 If it is necessary to limit the speed of a certain type of vehicle, it shall be indicated by an auxiliary sign. It should not attach graphics or text directly to the sign?€?s surface. An example is as shown in Figure 1.
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.3.2 Roadside development level mainly includes roadside land use types, such as urban areas, suburbs, residential areas, commercial areas, etc., as well as roadside non-motor vehicles and pedestrians.
A.3.3 Road characteristics mainly include road design criteria such as line shape, cross-section arrangement, lane width, line of sight, population density at intersection and access entry, line of sight at intersection, speed of adjacent roads, etc.
A.3.4 Traffic characteristics mainly include traffic flow and traffic composition. The traffic composition includes non-motorized traffic.
A.3.5 The degree of roadside development is the main reference for
determining the speed limit zone. The ideal situation is that the roadside development level is consistent with the maximum speed limit which is
determined by the road characteristics.
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. Table B.1 -- Conditions for collection of speed data
Factors Conditions
Week Monday to Friday
Day From 6 AM to 6 PM, non-traffic-congestion time
Environment Good weather with dry pavement
Sample Motor vehicles running under free-flowing conditions a
Type of motor vehicle All kinds of motor vehicles b
Location of investigation Location where the driver may not change speed limit in the driving process due to fixed or temporary road characteristics Location of instrument Concealed, not easy to be sensed by the driver
a It is generally believed that the frontal distance is at least 4 s and the rear car has no obvious intention to overpass the front car.
b Theoretically it includes all vehicle types. During actual measurement, it shall include the main vehicle types. The sampling ratio should be consistent with the ratio of the vehicle types of the actual traffic flow.
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.
Table B.2 -- Minimum sample size
Speed limit / (km/h) 40 50 60 80 90 100 110 120
Sample size / vehicle 55 65 85 110 130 155 200 275
Note. When the confidence is 98%, the confidence interval is ?? 2 km/h.
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.

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