M-40 Ring Road in Madrid

GPO provided the detailed design for a new interchange between M-40, a high capacity ring road, and M-511 road in Madrid. The main motivation for remodeling this interchange was to improve the safety conditions and service level.

The existing layout of the interchange consisted of an at grade roundabout between M-511 and the access/exit ramps of M-40. The central lanes of M-40 crossed M-511 by the use of two viaducts. Because the existing roundabout limited the capacity to provide the required eight turning movements between M-511 and M-40, traffic on M-511 was particularly impacted, as well as for cars exiting M-40. The project included: six viaducts between 75 and 115 m long, 4 overpasses and 12 drainage structures. The average daily traffic of this interchange is 74,000 vehicles/day.