Confusing Northbound Signs Just before the turnoff for Lazaro Cardenas, northbound traffic has a confusing combination of road signs. The first sign directs M-37 traffic to Lazaro Cardenas straight and M-37 traffic to Playa Azul and Uruapan to the right. Immediately after that is a sign that shows M-200 to Lazaro Cardenas straight and M-200 to La Mira to the right. Just take the curve to the right for this route. La Mira to Petatlan From the junction of Highway 37&200 at La Mira in Michoacan to Petatlan in Guerreo.