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Option #4: REALLY EASY. A really good idea is to take the metro to Balma Gramont, from there, 5 min away there is a ramp entrance to the "périphérique", a lots of cars go in that direction, cars can easily see you and stop, you can find people going torwards Bordeaux(A62) Montauban/Paris(A20) or Albi (A68). I've hitchhiked several times there any day any time of year and sometimes I've not been alone, there are often other hitchhikers going out Notrh from Toulouse there (especially during the summer). The big advantage is that you'll get there really easily, compared to the time it takes you to go to the péages, and if the person that stops isn't going in your direction they can always leave you at a péage. So if you're heading anywhere North of Toulouse you can think of starting at Balma.

Take metro line B to stop Borderouge, then change bus 40 or 73 or walk to stop Atlanta. Just walk along the Route d'Albi to the road sign post before the road splits to ramp onto A62 and hitch with a sign. The passing traffic goes to Albi via D888 or A68.