One of the most outstanding mayors was the engineer Martin Prado Vélez, who took over in 1949, and ruled the city during the reformist Presidents Juan José Arévalo and Jacobo Arbenz Guzman, although he was not a member of the ruling party at the time and was elected due his well-known capabilities. Of cobanero origin, married with Marta Cobos, he studied at the University of San Carlos; under his tenure, among other modernist works of the city, infrastructure projects included El Incienso bridge, the construction of the Roosevelt Avenue, the main road axis from East to West of the city, the town hall building, and numerous road works which meant the widening of the colonial city, its order in the cardinal points and the generation of a ring road with the first cloverleaf interchange in the city.