> On and off ramp lengths grow exponentially relative to target velocity Centripetal acceleration on a curve with radius r is (v^2/r) so it seems that it grows

> On and off ramp lengths grow exponentially relative to target velocity Centripetal acceleration on a curve with radius r is (v^2/r) so it seems that it grows quadratically, not exponentially. Exponential growth would mean that the v appears in an exponent in the formula.