Military Checkpoints in Mexico
Military checkpoints are set up along certain roads and highways. As you approach the checkpoint you will see several young men dressed in army green uniforms with guns. Some tourists do get nervous at this sight, but their purpose is to find drugs and contraband.
At some checkpoints you may even see a sign posted by the government for tourists so they feel more secure about the process. Be sure to slow down or stop if you are asked. They may ask you a couple of questions (although not in English) to find out where you are going (A dónde van?) and where you have been (De dónde vienen?). They may ask to do a routine check of your vehicle. Cooperation is key for a smooth exit.