Korea Automobile Testing Research Institute Submitted by the
Korea Automobile Testing & Research Institute Submitted by the Republic of Korea UNR 157 -05 -13 Minimum Following Distance for ALKS UN R 157 5 th SIG on 10&11 May 2021 MYUNGSU LEE Korea Automobile Testing & Research Institute
Korea Automobile Testing & Research Institute u The Korean Comment to Minimum Following Distance discussion Ø In 22 nd ACSF IWG(ACSF-22 -09 r 1, April 2019), a formula that considered the margin distance based on the braking distance of the state of art vehicles acquired on the wet road was proposed, but there was an comment from ACSF member that the Minimum Following Distance proposed was too long in the middle and high speed range Ø Therefore, in 23 rd ACSF IWG(ACSF-23 -07, July 2019), a renew formula that combines and the general time gap of European road traffic law with the braking distance was proposed Ø In conclusion, the proposal that the time gap gradually increase to 2. 0 s seems to be reasonable ACSF-22 -09 r 1(KOREA) ACSF-23 -07(KOREA) (UNR 157 -05 -03) Minimum Present speed of the ALKS vehicle time gap (km/h) (m/s) 7. 2 2. 0 10 2. 78 20 5. 56 30 8. 33 40 11. 11 50 13. 89 60 16. 67 70 19. 44 80 22. 22 90 25. 00 100 27. 78 110 30. 56 120 33. 33 130 36. 11 (s) 1. 9 2. 1 2. 3 2. 5 2. 7 2. 9 3. 2 following distance (m) 2. 0 GRVA-2020 -32(Germany) Minimum time gap following distance (s) (m) Minimum time gap following distance (s) 2. 0 1. 0 3. 2 1. 1 2. 0 MFD from current regulation 3. 6 5. 6 1. 2 9. 2 7. 2 1. 3 (0~60 km/h → 2. 0~26. 7 m) 14. 1 12. 1 1. 4 20. 3 18. 3 1. 5 27. 6 25. 6 1. 6 36. 3 1. 8 34. 3 1. 7 46. 1 2. 0 44. 1 1. 8 57. 2 2. 0 50. 0 1. 9 69. 5 2. 0 55. 6 2. 0 83. 1 2. 0 61. 1 2. 0 97. 9 2. 0 66. 7 2. 0 113. 9 2. 0 72. 2 2. 0 (m) 2. 0 3. 1 6. 7 10. 8 15. 6 20. 8 26. 7 33. 1 40. 0 47. 5 55. 6 61. 1 66. 7 72. 2
Korea Automobile Testing & Research Institute The comparison of 3 doc. plots 120, 0 GRVA-2020 -32(Germany) 110, 0 113, 9 ACSF-23 -07( ROK) ACSF-22 -09 r 1(UNR 157 -05 -03) 100, 0 97, 9 Distance[m] 90, 0 83, 1 80, 0 70, 0 MFD from current regulation (0~60 km/h → 2. 0~26. 7 m) 60, 0 61, 1 57, 2 50, 0 44, 146, 1 40, 0 34, 3 26, 7 30, 0 20, 0 10, 0 2, 0 0 3, 1 2, 0 3, 2 10 10, 8 6, 7 5, 6 9, 2 3, 6 7, 2 20 30 15, 6 14, 1 27, 6 20, 8 20, 3 72, 2 69, 5 36, 3 50, 0 55, 6 66, 7 72, 2 120 130 61, 1 55, 6 47, 5 40, 0 33, 1 25, 6 18, 3 12, 1 40 50 60 70 80 speed[km/h] 90 100 110
Korea Automobile Testing & Research Institute Appendix
Korea Automobile Testing & Research Institute Submitted by the Republic of Korea Informal Document - ACSF-23 -07 Minimum Following Distance to the front ACSF IWG 23 rd session on July 2019, Brussels Korea Automobile Testing & Research Institute
Korea Automobile Testing & Research Institute Comment Histroy
Korea Automobile Testing & Research Institute Plot for the respective formula
Korea Automobile Testing & Research Institute Safe distance between vehicles April 2010 Source : Conference of European Directors of Roads
Korea Automobile Testing & Research Institute Consideration of full range speed for next step (ALKS for high speed) Road speed limits are used in most countries to set the max. /min. speed at which road vehicles can legally travel on particular stretches of road. But, the speed range under min. speed is depending on particular situation(e. g. traffic Jam) and can be allowed Road max. limit speed (e. g. 130 km/h) General driving range Time gap = 1. 8~2 sec ALKS for high speed Road min. limit speed (e. g. 60 km/h) particular driving range ALKS for lowfor speed ALKS low speed Time gap < 1. 8 sec (e. g. traffic jam)
Korea Automobile Testing & Research Institute New Formula for Minimum Following Distance Low speed application High speed application
Korea Automobile Testing & Research Institute Plot for G/OICA vs. ROK 80, 0 German/OICA proposal 70, 0 ROK New proposal 72, 2 60, 0 55, 6 47, 5 50, 0 40, 0 33, 1 26, 7 30, 0 20, 8 20, 0 15, 6 10, 8 10, 0 2, 0 3, 1 2, 0 0 2, 0 10 6, 7 3, 6 20 40, 0 44, 1 66, 7 61, 1 55, 6 50, 0 34, 3 25, 6 18, 3 12, 1 7, 2 30 40 50 60 70 80 90 100 110 120 130
Korea Automobile Testing & Research Institute Appendix-1
Korea Automobile Testing & Research Institute
Korea Automobile Testing & Research Institute
Korea Automobile Testing & Research Institute
Korea Automobile Testing & Research Institute Plot for G/OICA vs. ROK vs. braking dist. 110, 0 German/OICA proposal S-braking dis. 100, 0 90, 0 ROK New proposal 80, 0 72, 2 55, 6 60, 0 47, 5 50, 0 40, 0 33, 1 26, 7 30, 0 20, 8 20, 0 10, 0 2, 0 3, 1 2, 0 0 2, 0 10 6, 7 3, 6 20 10, 8 7, 2 30 15, 6 66, 7 61, 1 55, 6 50, 0 44, 1 34, 3 25, 6 18, 3 12, 1 40 50 60 70 80 90 100 110 120 130
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