Prefix:
- BF - Business Farm to Market Road 
- BI - Business Interstate Highway 
- BS - Business State Highway 
- BU - Business US Highway 
- FM - Farm to Market Road 
- FS - Farm to Market Road Spur 
- IH - Interstate Highway 
- PA - Principal Arterial Street System 
- PR - Park Road 
- RE - Recreational Road 
- RM - Ranch to Market Road 
- RR - Ranch Road 
- RS - Ranch to Market Road Spur 
- SH - State Highway 
- SL - State Highway Loop 
- SS - State Highway Spur 
- UA - US Alternate 
- UP - US Highway Spur 
- US - US Highway 
Roadway Name:
- The middle of the Route ID is the roadway name. 
Suffix:
- AG = Right Frontage Road 
- BG = Right Supplemental Frontage Road 
- GS = Grade Separated Connector 
- KG = Centerline / Single Roadbed 
- LG = Left Roadbed 
- MG = Left Supplemental Mainlane 
- PG = Left Supplemental Supplemental Mainlane 
- RG = Right Roadbed 
- SG = Right Supplemental Mainlane 
- TG = Right Supplemental Supplemental Mainlane 
- XG = Left Frontage Road 
- YG = Left Supplemental Frontage Road 
- NG = Left Managed Lane 
- OG = Left Supplemental Managed Lane 
- UG = Right Managed Lane 
- VG = Right Supplemental Managed Lane 
Example of Texas DOT Route ID:
FM0043-KG
IH0010-KG
IH0035E-KG
SH0016-KG
Note: Off-system roadways may not follow the TXDOT Route ID structure.

