A 70km highway connecting 14 towns is being constructed south-east of the Madrid at an estimated cost of about US$627.54m.

The highway extends from Villanueva de la Canada to Ciempozuelos.

A stretch of the highway between Villanueva de la Canada and Navalcarnero will be made two-lane and dual carriageway, the WorldHighways website reported.

In addition, the project includes development of two stretches of the M-404 between Navalcarnero and Serranillos del Valle, and to Ciempozuelos.