Automatic Lights and Sirens:

 To make the lights  or  sirens  go on automatically, choose the school
 bus or police car and start a race. When it says the name of the place
 you are  press  brake, brake and then  hold  gas, after  3 seconds the
 lights or sirens should automatically go on.
 
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Bonus Cars:

 At the car selection screen, hold C-Up + C-Left + C-Down.

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Bonus Tracks:

 To access three tracks that you normally can not race without "Crusin'
 the USA", go to  the  track  selection  screen  and  hold  the  proper
 buttons:

 Golden Gate Park  L + C-Left + C-Down
 Indiana           L + C-Right + C-Up
 San Francisco     L + C-Right + C-Down

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Chicago Crash:

 As you begin the  Chicago  race  you will be on the freeway. After the
 first two turns you should see a broken  down  car. If you hit the car
 just right (causing it to  FLY  through the air) it will land in front
 of the first place person.

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Color Change:

 After you've earned new cars, press C-Up on the  Car  Selection screen
 to change your vehicle's color.

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Easy Upgrades:

 Here's a faster way to update cars in a two-player game.

 Start a two-player game, and race until you reach Washington D.C. When
 the DC race begins, press Start and quit the game.

 Next, have  player #1  return  to Washington D.C. and upgrade his car.
 After player #1  has  finished, player  #2  should  do the same thing.
 Happy cruising!

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Flashing Lights and Siren:

 Start a new race as the  School  Bus or Police Car. While playing, tap
 Brake, Brake, Gas to flash your lights and/or sound your siren.

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Lost Wheels:

 After a  two-player  challenge  game, the losing  player's right front
 wheel will fall off if you  continuously  rotate  the analog  joystick
 clockwise.  This should  happen after the car rotates 3-4 times.  Talk
 about driving till the wheels fall off!

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Nitro Boost:

 Enable the  "Secret Head"  code, then start a new race. While driving,
 press Brake, Brake, Brake, Gas, Brake, Gas after each checkpoint for a
 nitro boost.  This won't increase your top speed, but it will increase
 your acceleration.

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Secret Head:

 To view the  secret  head, make a "Hot Time" on any stage.  Enter your
 initials and scroll down to the  bottom  of the screen, then hold Left
 on the analog stick for about 35 seconds.  A head  should  come moving
 down the conveyer belt saying "I love this job."

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The Iowa hitch hiker:

 In Iowa go to the  second  field of corn and find the pine tree in the
 left and middle of the field. and you should see a hitch hiker.

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Turbo Boost:

 While driving, pump the  gas  twice  and you will do a  wheelie and it
 will give you a turbo boost.