DMSs on SH-121 North
| DMS ID | Message |
| S121.Harwood.NB | 1102 DEATHS THIS YEAR ON TEXAS ROADS, DRIVE SMART CLICK IT OR TICKET |
| S121.Handley.EB | 1102 DEATHS THIS YEAR ON TEXAS ROADS, DRIVE SMART CLICK IT OR TICKET |
| S121.Hall-Johnson | No Message Currently Displayed |
| S121.Fairview.NB | 1102 DEATHS THIS YEAR ON TEXAS ROADS, DRIVE SMART CLICK IT OR TICKET |