One particularly heavily traveled road is 49a Avenida Norte, which connects with the RN-5 highway to the airport. An important historical street is Calle Arce, which was closed in order to create a pedestrian-only mall in the historic downtown of San Salvador. Some streets in the city are very narrow with little room for cars to pass, although many streets are wide. Speed limits are  on highways,  on main roads, and  on secondary streets and avenues.