How will connected and autonomous vehicles (CAV) impact highway design?

CAV impacts on highway design: (1) Capacity - potential 50-100% increase through closer headways and platooning, (2) Geometric design - may allow reduced stopping sight distance, tighter curves due to faster reaction, but mixed fleet period requires conventional standards, (3) Lane width - potentially narrower with better tracking, (4) Infrastructure - V2I communication needs (DSRC or C-V2X), high-definition mapping, (5) Intersections - may eliminate signals with vehicle coordination, (6) Parking - reduced urban parking needs. Transition period with mixed human/automated vehicles poses challenges. Design flexibility recommended for uncertain future.