Type the cheats below at any menu to activate the cheat. 

madland - Unknown.
rushhour - Race with lots of traffic on the road.
empire - Race on the Empire City track.
elninor - Race with the El Nino car.
merc - Race with the Mercedes CLK GTR.
gofast - Make your car go super fast in Single Race mode.
allcars - Enable all cars including Pursuit Vehicles. 

Type the cheats below then click RACE to drive the different non-player cars. 

go01 -Miata
go02 -Toyota Landcruiser
go03 -Cargo Truck
go04 -BMW 5 Series
go05 -71 Plymouth Cuda
go06 -Ford Pickup with Camper Shell
go07 -Jeep Cherokee
go08 -Ford Fullsize Van
go09 -64/65 Mustang
go10 -~66 Chevy Pickup
go11 -Range Rover
go12 -School bus
go13 -Taxi - Caprice Classic
go14 -Chevy Cargo Van
go15 -Volvo Station Wagon
go16 -Sedan
go17 -Crown Victoria Cop Car
go18 -Mitsubishi Eclipse Cop Car
go19 -Grand Am Cop Car
go20 -Range Rover Cop Car/Ranger Vehicle
go21 -Cargo Truck (same as 03)