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Querétaro and [[United States of America|United States]]: take a metro to Buenavista where you take another suburban train (note that special card is required to go on it). Take the suburban (15 pesos) all the way to the last stop at Cuautitlan (I think they are building an extension of the line) and get off at the left side of the track. Cuautitlan is one of the side cities of metropolitan Mexico. The caseta (toll gate) going north is about 7-8km from metro Cuatro Caminoshere. In Cuautitlan you can ask around for the main square or the main road "De Guadelupe" which goes towards the highway. Somewhere here you can find buses (8 pesos) or minibuses going to the caseta (toll gate). Ask around.Note, the bus follows the highway, but it doesnt pass the toll gate. Just few hundred meters before the caseta the buses turns in to some other town and you have to jump off. But then its easy, you walk have only 5 minutes to walk (you can see the toll gate from when the periférico which bus turns into the autopista a Querétaro). You can take Its a minibus further out (main toll gate is about 30 km northof of Mexico, so you might have company of some other mexican hitchhikers :) or hitch  P.s. I think you can get on buses going towards the caseta from the suburban train station of Lecheria (just a few stops before the Cuautitlan). Didnt checked it upmyself though.