Placement Distance of Exit Advance Guide Sign on an Eight-Lane Expressway Considering Lane Changing Behaviour in China

  • Xiaozhi Su College of Transportation Engineering, Chang’an University
  • Yanfeng Ma College of Transportation Engineering, Chang’an University
  • Rui Li College of Transportation Engineering, Chang’an University
  • Xujiao Sun College of Transportation Engineering, Chang’an University
  • Yanwen Han College of Transportation Engineering, Chang’an University
Keywords: advance guide sign, lane change distance, field driving experiment, levels of service, traffic simulation


The reasonable placement of the advance guide signs (AGSs) is important in improving driving efficiency and safety when exiting an expressway. By analysing the lane-changing process when approaching an exit on new two-way eight-lane expressways, we modified the tradi-tional AGS model lane-change distance formula. To this end, a field experiment was designed to explore the lane-change traversal time at the free flow condition (LOS 1). Considering the limitations of the experimental equip-ment, lane change distance at the worst levels of service was explored using VISSIM simulation. The results show that the eight-lane changing distance based on modified theoretical calculations, revealed a minor difference with VISSIM simulation in free flow condition. Further-more, placement distance at the worst levels of service are discussed. Then placement distance of all-level AGSs is recommended to be 3 km, 2 km, 1.2 km, and 0.8 km, considering the driver's short-term memory attenuation calculation formula. Determining the two-way eight-lane AGS placement distance from the perspective of LOS can provide a basis on which to supplement the existing stan-dards and references for the AGS placement distance af-ter the expressway expansion in China.


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How to Cite
Su X, Ma Y, Li R, Sun X, Han Y. Placement Distance of Exit Advance Guide Sign on an Eight-Lane Expressway Considering Lane Changing Behaviour in China. Promet [Internet]. 2022Apr.13 [cited 2024Apr.18];34(2):285-9. Available from: