Slow Traffic Vehicles moving slower than the traffic flow must use the available right lane or stay as close as possible to the right-hand curb or edge of the roadway
Note that it does not say "speed limit." So if everyone else is driving faster than you (even if you are going the speed limit), you are still required to move to the right lane.
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FFBE: 083,672,556 || Chaos || Have GameFAQs/GFAQs in tag or I will not accept.