Operating in Detroit since 1921, Checker is the oldest and largest livery company in Michigan with 400 vehicles servicing in excess of 12,000 passengers daily in metropolitan Detroit. There is always a Checker nearby to service all your transportation needs 24 hours a day, 365 days a year, We Deliver Detroit! Checker utilizes a state-of-the-art dispatch system that includes automated trip booking for repeat customers and wireless computers in each vehicle equipped with GPS and turn by turn directions ready to service you in a moment s notice. This technology allows customers the choice of booking a trip through the automated dispatch system or directly with a customer service representative.