A study of the planned rapid bus route along Montgomery County’s Interstate 270 corridor found that the first phase of the system could be built for just $235 million, $310 million less than the Maryland Transit Administration’s cost estimates. But county lawmakers are worried that less is not more.

The study by Baltimore engineering firm Kittelson & Associates, was commissioned by a group of property owners adjacent to the planned Corridor Cities Transitway — or CCT — route. It found that by having buses run in mixed traffic on parts of the route, building temporary stations and forgoing items like park-and-ride facilities, the first phase could be built less expensively and be completed sooner.