If you are talking about freeport pkwy just north of the DFW airport then do yourself a HUGE favor and don't go anywhere near 635 northloop. Most of 635 between 75 (central) and 35E is under MAJOR reconstruction. Check your route, but you may want to take 80 to 30 going west. Follow 30 into downtown until it merges with 35E. take 35E north and then merge into route77 (also called Stemmons freeway). that will connect to 183/114. continue on 114 north (west) and it will take you directly to freeport pkway. On Friday, downtown lets out a little early, so after 3pm traffic EVERYWHERE starts to get a little thick. Good luck. HTH