Need for Speed: Hot Pursuit Tips

Get nitrous faster
When playing as a racer, if you do illegal things such as driving on the wrong side of the road, your nitrous bar fills up faster.

You could: -

Near Miss - You drive past a normal car*, but nearly missing it. You dont really have to be close to it to get a 'near miss'.

On coming - Drive on the wrong side of the road. This is the easiest way to get your nitrous bar filled up quickly.

Slipstreaming - Drive behind a racer and your speed will gradually increase.