This is different from the advice we got during traffic school from an off-duty CHP officer.

His suggested steps:

  1. Turn on the inside cabin light (the overhead light).

  2. Pull over.

  3. Turn off your engine, but leave the key turned to Accessories so you can
     roll down the windows later.
     (But wait until commanded to do so.)

  4. Put your hands on the top of the steering wheel.

  5. Refrain from:

    a. Rolling down any windows.

    b. Reaching for the glove compartment.

    c. Reaching for your wallet.

    d. Opening the car door.

  6. Await further instructions from the officer, follow lawful orders.