You stand still for up to five seconds, even though there are no vehicles nearby, until clearance is given. Gaps between vehicles are ignored, even though 10 vehicles could fit between them.
Ideas
*update from my last comment*
this now happens to me every race no matter who i drive as, i either get an issue on lap 1 or i get stuck when i need to box. This issue really has made the game unplayable especially if your team is competitively challenging for titles