Guidance
    Exclusive lanes may only be used when:
- there are two or more lanes adjacent to the proposed exclusive lane for the use of other vehicles; or
 - there is a multi-lane facility adjacent to the proposed exclusive lane for the use of other vehicles.
 
A toll may be charged for the use of the exclusive lane if:
- the lanes or multi-lane facility adjacent to the exclusive lanes are also tolled; or
 - a vehicle authorized to use the tolled exclusive lane is authorized to use non-tolled adjacent lanes or an adjacent non-tolled multi-lane facility.
 
 of the 
Texas Manual on Uniform Traffic Control Devices
 (TMUTCD) provides guidance on the design of exclusive lane signing.