HOUSTON (KTRK) -- Ridesharing service Lyft told customers it is leaving Houston within weeks.In a letter sent to all Houston Lyft users Wednesday night, the company says it will cease operations Nov. 20 at noon.Back in August, Houston City Council passed a new set of regulations so ride-sharing companies can operate legally. Those new regulations go into effect next week, but the rules force companies to follow many of the same rules and regulations as taxicabs.Lyft says the new standards would require fire extinguishers in all cars and would force drivers to take medical exams. The city's methods would make it impossible for Lyft's part-time drivers, the company said in a statement.