I'd lift the speed limits on the motorway, after a good fast run, I like nothing better than to just cruise back home sticking with the speed limits in the city (mostly 30 MPH). Becuase there are cameras everywhere, poeple race in certain spots where it could be dangerous to do so, then an accident happens and it's all over the papers, "BOY RACERS DIE IN A BALL OF FLAMES". Then what happens is the normal decent modder gets tarred with the same brush as these nobs who race everywhere.
If you've gone for a good legal (If there's no speed limit on the motorway) blast and at a speed you're comfortable with, then you'll be a lot more less likely to want to race when you've had a good rush and are on the way back home.
Yes, I've broken the speed limit, who hasn't? But I'll only do it when I'm certain that I'm not putting anyone in danger but me (motorway, 2am, no traffic at all on the M1) and that I'm certain my car is up to the job.