May absolute least favorite thing to do in Las Vegas is to take a cab from the airport to my hotel. Even when you tell them just how you want to go, they still try to long haul you. Most know that the tunnel is a long haul. If the driver says something like do you want me to take the shortest distance or the fastest way, they want to long haul you. They are trying to be tricky and "get permission" to take the tunnel (of course many just take it without this word game, but some on probation use such language). If you tell them the proper way to go and they get upset and then blurt out there is construction, then there is a very good chance they are lying (of course there is a ton of construction and it is possible, but I still have them go the right way and it is not a surprise that overwhelmingly construction is not an issue).
Please be aware that the main issue is not rogue drivers. It is systemic with cab companies pressuring drivers to reach quotas, and all but forcing them into such action. Plus there have been some stories that at certain points in time, the taxi commission/authority was discouraging reports from individuals calling to press the issue (I guess this depends on who is running the taxi commission/authority at the time).
My understanding is that there was a solid proposal by one recent person running the taxi authority to charge one flat rate for all passengers going to strip hotels. The rate was a couple of dollars more than the average trip would cost. In theory this would have netted honest companies more money and all but done away with passenger fears of being cheated. Guess what? The taxi companies killed the proposal. To me that tells me that the couple of dollars more earned over the honest rate for each trip, nowhere near made as much as their standard dishonest practice.
What is a passenger to do? Get the drivers name and number, which is easily identified on the right hand side of the dashboard (plus know the companies name like Desert Taxi) and file a complaint with the taxi commission/authority. Also, please express your anger to the hotel. The hotels have power in Las Vegas and do not want their customers saying their trip was ruined by a cab ride.
Lastly, please do reward the honest taxi driver with a good tip. Times are tough for them and they are often under a lot of pressure to cheat. Treat them right, they deserve it!