2x2 lanes in the section through the southern Alps from Nice Saint-Augustin to the frontier with Italy, this section has 15 tunnels. There is a speed limit of 90 km/h in the tunnels (70 km/h for large vehicles).
The road has heavy traffic all year round and is especially congested in July and August (in particular around Antibes and Nice. As a result, traffic-management schemes have been adopted between Var to Nice-West similar to those on the Péripherique in Paris. The autoroute is regularly closed on the Nice-Menton section as a result of rock falls onto the carriageways. The sections crossing the Maures and L'Esterel mountains are at risk from forest fires in summer.