1. Merge onto US-75 S/TX-121 S 

2. Take the Sam Rayburn Tollway South exit, EXIT 38C.
 

3.  Merge onto TX-121-TOLL S/Sam Rayburn Tollway (Portions toll) (Electronic toll collection only).

4. Take the exit toward FM-544/Carrollton/FM-2281.

5.Turn slight left onto TX-121.

6. Merge onto TX-121-BR S.
(If you are on TX-121 and reach FM-544 W you've gone about 0.3 miles too far)

7. 1047 E STATE HIGHWAY 121.
(If you reach Valley Ridge Pky you've gone about 0.3 miles too far)