Tarbes is a city in southwest France.
East towards Toulouse A64
You can reach the toll to go on the A64 by foot. Go to the city of Séméac and follow the D817. Just after walking on top of the highway, take right at the first roundabout, then right again at the second: here is the toll. Your hitchhiking spot is just before it where cars slow down and can stop .
Be careful to ask Toulouse, a lot of people only go to Lannemezan, in this case they will drop you out of the highway.