I thought Freeway Fury 1 was a fun little time waster, but ultimately unfulfilling. Freeway Fury 2, however, fixed that nicely, with having such a variety of different environments to berzerk through.
Two things did bother me, though.
1: To get to the left-hand offramps, you have to go to the left side of the screen. This may seem like a no-brainer, but it means you have to cross three lanes of oncoming traffic. The left-hand paths, therefor, seem arbitrarily more difficult to reach than the right-hand paths. You might want to readjust the maps so that the left-hand offramp is on the left-hand side of the right-hand highway.
2: The alien boss fight. Once I figured it out, I thought it was clever, but it's not obvious at all that by passing to the left side of the screen, you can build your turbo-boost by receiving the Oncoming bonus. It's not obvious, because there's no oncoming traffic, and at first I believed it would be disabled! Perhaps you should give the Oncoming turbo-boost across the whole screen, or at least inform the player point-blank that being on the left-hand side of the highway gives you nitrous even though there isn't any oncoming traffic.