Prolongement du visa américain au Mexique après 90 jours?

Bonjour,
Je prépare un voyage a vélo à travers le sud des USA. 3 mois ce n'est pas assez.
Croyez vous que je peux aller au Mexique a vélo le 90eme jour et re rentrer pour obtenir a nouveau 90 jours?
Merci de partager votre experience, les "il parait"j'en ai déjà plein...

On a deja pose cette question est la reponse, "non", n'a pas change. Du site du gouvernement americain:help.cbp.gov/...ers/detail/a_id/194/~/visa-waiver-program--eligible-countriesWhat are customs and immigration regulations for Canadians and travelers from Visa Waiver Program - eligible countries?
If you are from a visa waiver program country and you are coming for tourism or business (but not for employment or as a working member of the media) you may enter into the U.S. (including Hawaii, Alaska, Puerto Rico and the U.S. Virgin Islands) for up to 90 days. If you wish to visit the U.S. for a longer period of time, you will need to obtain a visa.
If visiting the U.S. under the visa waiver program you may not apply for an extension of stay.
While in the U.S., you may go to Canada, Mexico and the Caribbean and Adjacent Islands and re-enter the U.S. using the I-94 admission notation you were issued on your VWP passport when you first arrived in the U.S., although the time you spend there is included in the 90 days allotted for your visit.
If you go to Canada and Mexico or the Caribbean, and while you are there, your initial 90-day period of entry expires, but you need to come back in to the U.S. to fly home, you may encounter a problem. The terms of the VWP are very clear - it is only to be used for occasional, short visits to the U.S. If the CBP Officer thinks you are trying to "reset" the clock by making a short trip out of the U.S. and re-entering for another 90-day period, you can be denied entry. (If that happens, you will have to obtain a visa for any future travel to the U.S.) In order to be re-admitted to the U.S. shortly after a previous admission expired, you will have to convince a CBP Officer that you are not trying to "game" the system.
If you are coming under the VWP, you must apply in advance for an Electronic System Travel Authorization. We recommend you apply at least 72 hours in advance of your travel, but emergency, last minute travel can usually be accommodated.If you visit other countries such as England or Costa Rica, then return to the U.S., your re-entry will be considered to be a new admission (thereby restarting the 90 day clock), rather than a re-entry from a contiguous country in the course of your initial visit, and the admission inspection may be more strenuous. The Officer inspecting you will want evidence that you intend to go back home to your country of citizenship to live as opposed to returning again and again to the U.S. after visits to other countries.If you are from Canada, the length of stay for tourism is up to 6 months. Canadians may file for an extension of stay with the U.S. Citizenship and Immigration Services.