It has several categories of routes: Local, Flyer and Limited, Feeder, Crosstown, Special services and UT Shuttles.

The majority of the current bus fleet consists of vehicles produced by two manufacturers, Gillig and New Flyer, with only relatively small generational design variations, most visibly in the use of flip-dot destination displays on older series versus LED displays on newer buses.

A few smaller series of buses were acquired from other manufacturers, notably Optima (used preferentially on MetroRail shuttles) and MCI (used on express services).

Older bus series produced by TMC and Blue Bird are no longer in service.

Since June 2014, the remaining lines no longer use Congress Avenue between 11th Street and Barton Springs Road.

Instead, Round Rock contracts CapMetro to provide certain mass transit services for the city.

In January 2014, CapMetro launched a bus rapid transit service branded "MetroRapid," utilizing articulated buses operating in shared lanes with automobile traffic.

A second route, MetroRapid Burnet/South Lamar (803), serves a total of 24 stations between The Domain and Westgate.

[8] Both the 801 and 803 drew citizen protest until premium fares were discontinued in 2017 and the 801 had also reduced frequency of the then operating 1L/1M.

CapMetro, in turn, then subcontracted out to Laidlaw International, Inc., who had, up to that point, operated orange and white school buses[12] for the university on a contractual basis.

In so doing, CapMetro brought air conditioning and wheelchair accessibility to the shuttle service for the first time.

[20] The UT Shuttle system includes a number of routes during the University of Texas semester.

These buses ran only evenings and late nights on weekends and did not run in summer.

[26] The E in "E-Bus" stands for "eating and entertainment" and funding was initially provided by companies advertising on the bus.