Leaving immediately would involve jumping some barriers in a (mostly) unsuited terrain. But it would also lead to an unexpected lead since the other teams 'know' that they've still got exactly so much time before Derple and party can leave.<br/><br/>Of course, waiting is a safer option, because there's no risks about not jumping high enough or landing too hard because the road was lower than expected, and that makes it easier to pace out.<br/><br/>(Jumping means a Speed environment for the chase, waiting Handling environment.)