Impacts of cooperative adaptive cruise control and cooperative lane changing on delay and riding comfort in autonomous car-autonomous truck mixed traffic

This study examines the impacts of cooperative adaptive cruise control (CACC) and cooperative lane changing (CLC) on the delay and the riding comfort in autonomous car-autonomous truck (AC-AT) mixed traffic at a freeway merging area. For this task, AC-AT mixed traffic on a 5.25 km section of freeway was analyzed using the Aimsun Next microscopic traffic simulation. The effects of different CACC parameters and CLC on the average speed and acceleration distributions as the measures of delay and riding comfort, respectively, were evaluated. It was found that (1) lower sensitivity to the lead vehicle reduced the merging time, (2) shorter time gaps between autonomous vehicles and between platoons decreased the delay, and (3) longer time gaps reduced the delay at higher percentage of ATs. These results demonstrate that the delay of AC-AT mixed traffic at a freeway merging area can be reduced and riding comfort can be increased by adjusting CACC parameters.