Hmm, wasn't Highway Patrol also like this ?
Or mabe Cisco Heat ? I remember you had to take some
exits there, but I think you couldn't miss them but were forced to
take them because otherwise you crashed... Bah,
cannot remember really, but I know I finished this game
after lots of trying !
There was also a similar game called 'The Big Run'.
Check HOL for those 3. Maybe it was one of them ?