A speeding ticket written in Dallas has some codes handwritten by the officer that I hope someone can help me understand:

1. right next to the printed word/checkbox for "Speeding" are handwritten "SL" and "494".

2. In a blank area near the bottom of the ticket I see:


I'm thinking the WB is westbound, and the 1Pass is 1 passenger in the car. But 3 of 3? O.F.?

Thanks in advance for any help.