The filename 21654.rar most likely refers to the , which governs slow-moving vehicles on highways. California Vehicle Code § 21654
This law mandates that any vehicle traveling slower than the "normal speed of traffic" must stay in the right-hand lane.
Regardless of the posted speed limit, if you are driving slower than other traffic, you must stay in the right-hand lane or as close to the right curb as possible. Exceptions: You may move out of the right lane if you are: Overtaking and passing another vehicle.
If this file is related to information security or software, it may refer to:
Authorities (Caltrans or local) may place signs specifically directing slow traffic to use the right lane. Other Possible References