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Yeah, there's one easy way to avoid a DUI, which is to call a cab. The problem is that there's a risk/reward issue here. Cabs are ridiculously expensive, and I won't be able to go out and party as often due to financial restraints if I go down that road. You do hear about celebrities getting DUIs quite often, but I'd bet that middle and lower class people receive them at much higher rates.
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Here's a good thread that was in politics that deals with Taxi monopolies, and explains why they're so expensive in certain places.