Concessionary network including A27 (Viana do Castelo / Ponte de Lima) and A28 (Porto / Vilar de Mouros) highways. The A27 - Lima Valley highway, located in Viana do Castelo district, follows the Lima River Valley. The A28 - North Coastal Highway - is a structural axis of the Northern Portugal region, which connects Porto with Vilar de Mouros, crossing the districts of Porto, Braga and Viana do Castelo. This network is part of CINTRA concession, one of the largest private promoters of transport infrastructure in the world.
Periodic monitoring of day and night visibility characteristics of road markings with the dynamic retroreflectometer equipment (Ecodyn) and the coefficient of friction with the British Pendulum.
Road mark monitoring, data processing and Reporting.