What Is a Safety-Sensitive Function under FTA Rules?

49 CFR 655.4 defines safety-sensitive functions for transit testing. They include operating a revenue service vehicle, even when it is not in revenue service, and operating a nonrevenue service vehicle that requires a commercial driver's license. They also include controlling dispatch or movement of a revenue service vehicle, maintaining revenue service vehicles or equipment, and carrying a firearm for security purposes. The definition limits the maintenance category for certain employers that contract out those services.