In the best of all possible scenarios, you'll be familiar enough with Las Vegas to recognize that you're getting ripped off while it's happening. So, if you know where you're going and are aware that the driver is taking you the long way, let him (or her) know that you know what's going on. Inform him firmly that you're not going to pay the exorbitant fare. If you know what it should be, tell your driver that that's exactly what you're going to pay.
If you don't know the shortest route and correct fare, but your instincts tell you that you're being ripped off and the driver gives you trouble, call the Taxicab Authority (TA) at 702/486-6532 and complain. You can also contact them online at www.taxi.state.nv.us. Be sure to give them the driver's permit number. This is printed in red on the Taxicab Driver's Permit, which should be displayed prominently somewhere in the cab. Always look for the permit when you're riding in a taxi, to make sure that the taxi and driver are legit and to cover yourself if you have to complain.
You can also demand that the driver contact Dispatch and ask for a Road Supervisor. Most drivers will do anything to avoid the TA or their supervisors! If the driver is in the wrong, the Road Supervisor will make him "eat" the fare and most companies will suspend him for a day or two. If the TA shows up, the driver will get a ticket with a very hefty fine, plus a possible suspension.
Note: Don't feel embarrassed about taking action. The driver knows the rules and should pay the penalty for not following them.
