You should be aware when driving in Mexico, especially in a foreign vehicle, of the danger of bandits . Robberies and even more serious assaults of motorists do occur, above all in the northwest and especially in the state of Sinaloa. Sometimes robbers pose as police, sometimes as hitchhikers or motorists in distress, so think twice about offering a lift or a helping hand. They may also try to make you stop by indicating there's something wrong with your vehicle. On the other hand, remember that there are plenty of legitimate police checkpoints along the main roads, where you must stop. Roads where there have been regular reports of problems, and where you should certainly try to avoid driving at night, include Hwy-15 (Los Mochis-Mazatlán) and express Hwy-1 in Sinaloa, Hwy-5 (Mexico City-Acapulco) in Guerrero, Hwy-75 (Oaxaca-Tuxtepec), Hwy-57 (San Luis Potosí-Matahuela), and near the border, in particular on Hwy-2 (Mexicali-Agua Prieta) and Hwy-40 (Matamoros-Monterrey). The US embassy in Mexico advises never driving after dark.