The Zona Azul Facil application SP Oficial CET CET was created to replace the blue card of the rotary parking of Sao Paulo. In just a few clicks, the user of the capital can buy Digital Blue Card (CAD). It's simple and practical. Sign up and pay with credit card, debit card or ticket. The Blue Zone app was developed by the Traffic Engineering Company (CET SP) to replace the blue zone paper card in Sao Paulo. The driver now chooses the parking space in the rotating parking lot and can quickly activate or renew the Digital Blue Zone (CAD). In just 4 steps, you buy rotary parking time (digital card) in the capital. Stop your car in the chosen spot of Zona Azul SP. Sign up for the app in less than a minute. Insert plate, rule and dwell time.