There are three racing spots in Greenvale:
Greenvale High School on Lincoln Street (near the Sheriff Department)
The races are timed and you must drive through checkpoint markers as they appear on the road. There’s no need to wait until you upgrade or buy a faster car because it’s possible to win every race in a standard police patrol car and never use your siren boost!
Races are definitely worth completing because you are rewarded with a bunch of Agent Honor and a trading card and are available for completion at any time of day and in any weather condition.
Below are video run throughs and maps that I created for each available race.