Under Department of Transportation (DOT) Americans with Disabilities Act (ADA) regulations at 49 C.F.R. Section 37.131(e), complementary paratransit service must be available during the same days and hours that fixed route service operates. Thus, if an individual can travel from a given origin to a given destination on a particular fixed route at a certain time of day, a paratransit eligible person must also be able to travel from the same origin to that same destination on paratransit at that time of day. Because paratransit service is required to be available during the same hours and days as the fixed route system, and because not all fixed routes will necessarily be operating at a given time on a given day, the shape of the paratransit service area can be expected to change accordingly. For example, it is common for certain routes to not run late at night. Those routes, and their associated paratransit corridors, do not need to be served with paratransit when the fixed route system is not running on them.