The flag should not be draped over the hood, top, sides, or back of a vehicle, a railroad train, or a boat.  When the flag is displayed on a motorcar, the staff shall be fixed firmly to the chassis or clamped to the right fender.  (U.S. Code, Title 4, Chapter 1, Section 7(b))

We thus recommend that the flag be attached to the right (passenger) side of a vehicle.

We recommend that flags be removed from vehicles at night since they cannot be properly illuminated.  The U.S. Code states, “…when a patriotic effect is desired, the flag may be displayed 24 hours a day if properly illuminated during the hours of darkness.”  (U.S. Code, Title 4, Chapter 1, Section 6(a))

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