When I got my yak, I went to the CHP office and asked them. In a nutshell. You may extend one half the length of you vehicle. In other words, if your truck is 16 feet from front to back, you can extend 8 feet past the end of vehicle, not including the bumpers. Must have red flag during the day and a red light during the night. Also does not include a tailgate in the down position.
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