samsam

We just purchased EZ tag [new to Houston from Alaska] and need to use Westpark Tollway today. We live just west of Grand Parkway. It looks like the entrance to the tollway is near Westheimer and 1464? I know Westheimer Parkway and think 1464 is an intersection with light. Is this how we get there, or do we go East on Westheimer to get on? Thanks so much