A thought occurs: this is related to PCs. Something "unexpected" requires you to make a test. So...
"Okay, you successfully cut off your pursuer, causing them to slam on the brakes as you swerve into the off-ramp.
"The Americar behind your pursuer tries to avoid them, spins out, and rear-ends their van. GridGuide scrambles to redirect traffic, but you drive away from a six-car pileup, and counting."
(Also, wow, this has been a wild ride from start to presumable finish)