 Where sedan services are cheaper, many such providers use older vehicles, and do not have the same level of protection as taxicabs, which has raised concerns in some places for both the drivers and passengers.Some cities that have shortages of taxicabs encourage the use of sedan services to supplement the number of cabs on the streets.In the U.S. state of Maryland, the legal definition of a sedan service is the operation of a motor vehicle for hire using a motor vehicle designed to carry 15 or fewer persons, including the driver.