The green band features two keys, one across the other. One is gold and the other silver, symbolizing the Apostle Saint Peter, the patron saint of the city. Toa Baja's coat of arms features a green waving stripe, representing the Toa River, one of the first mentioned in the history of Puerto Rico. Like the flag, it features two keys, one across the other, symbolizing Saint Peter, patron saint of the town. The coat has the letters "F" and "J" to each side of the keys, representing Ferdinand II of Aragon and V of Castile, and his daughter, Joanna of Castile, sovereign of Castile and León. The gold fields above and below the green stripe represent the wealth of the city. It also feature handfuls of yucca, one of the main crops of this area. It constitutes a symbol of the Taínos who cultivated it, and whose main food was cassava or bread of yucca. Two sugar cane stems surround the shield, representing the cultivation and industry of sugar cane, which was the main source of Toa Baja's economy. Toa Baja is approximately 25 minutes in non-rush hour from San Juan by car, however, it may take up to 90 minutes in rush hour. The main road to the city is the PR-22 and Road #165. A new bus rapid transit (BRT) system called Metro Urbano operates in the center of José de Diego Expressway (PR-22) in high-occupancy vehicle lanes (HOV) from Candelaria in Toa Baja to the Bayamón Station of the Tren Urbano. There are 29 bridges in Toa Baja.