Okay so You Wanna Beat NFS 14 "One of Five"

Don't listen to those who say you need to knock out the police. The secret is speed, speed, speed. Also don't forget that your two jammers disable the coppers ability to deploy spike strips. So hit the nitrous, hit the turbo (on one of the longer straight-aways), and "jam" those spikes the best you can. You will find it's easy to get silver with this method and you'll get gold after a few tries.