Revelers ringing in the New Year have a few free and discounted options to ensure safe, sober travels around Houston.

Dec. 31 is one of the busiest nights of the year for drivers of taxis and those connecting with riders via smartphone apps such as Uber and Lyft.

As a result, it can also be among the mostly costly or complicated. Drivers are in demand, and the app-based companies charge rates to encourage drivers to log on and offer rides. That means prices can skyrocket, especially shortly after midnight until about 3 a.m.

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There are options to lower the costs, but they are in limited supply. A promotion Uber ran for $10 off rides in the Houston area ended Saturday, when some received a message that the promotion met its allowable capacity.

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The law firm of Sutliff & Stout, with offices in Houston and Austin, is offering up to $30, including a tip to the driver, for paid trips in both cities. The promotion is limited to the first 1,000 applicants, who mail their receipt, a copy of the driver’s license and a PayPal-associated email address to the law firm.

The only guaranteed free ride in Houston is Metropolitan Transit Authority, which is waiving bus and rail fares from 6 p.m. Sunday to 6 a.m. Monday.

Rail service on Sunday night is extended to 2 a.m. to allow people more time to get home along the Red, Green and Purple lines.

Buses remain on their normal schedules, meaning most people will have to hustle for the first few minutes of 2018 if they hope to catch a bus. Major bus routes typically end around 12:30 or 1 a.m.