What are the laws about flashing headlights to pass?

In California, the laws regarding flashing headlights to pass vary based on the situation. It is illegal to flash your lights for the purpose of warning other drivers about a speed trap or to notify them of an impending traffic stop. However, if you are driving on a dimly lit road and you flash your headlights to alert an oncoming driver of your presence, you may do so. It is also legal to flash your headlights once as a courtesy to let an oncoming driver know that you are yielding the right of way. In addition to the above situations, California law allows for drivers to flash their headlights for the purpose of passing another vehicle. While this may be done in some states without consequence, California requires that you first use your turn signal to indicate that you are preparing to pass. Then, you may flash the headlights once as a warning to the oncoming vehicle that you will be passing. In summary, flashing headlights to pass is legal in California, but it must be done according to the law. You must first use your turn signal to indicate that you are preparing to pass, then flash the headlights once to indicate that you are actually passing. As always, it is important to be aware of the laws in your area so that you can remain safe and legal while driving.

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