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GB 5768.5-2017: Road traffic signs and markings - Part 5: Speed limit Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
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/GB5768.5-2017GB 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 ContentsForeword... 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... 16ForewordAll 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 limit1 ScopeThis 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 referencesThe 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 markings3 Terms and definitionsThe 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 provisions4.1 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 value5.1 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 sign6.1 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 sign7.1 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 pavement8.1 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. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB 5768.5-2017 be delivered?Answer: The full copy PDF of English version of GB 5768.5-2017 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB 5768.5-2017_English with my colleagues?Answer: Yes. The purchased PDF of GB 5768.5-2017_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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