Traffic in both directions on the A-7 motorway by the Arroyo de la Miel - Benalmádena turn-off was cut off for 10 minutes on Tuesday night to allow National Police explosive experts to dispose of a device discovered by a construction worker during work to improve the junction.
The alarm had been raised earlier in the day when the worker spotted apparently live explosive, complete with detonation cable, of the type used to blast rock apart during building work.
The device is believed to have been left behind by construction workers when the A-7, which opened in 1992, was originally built.
A new exit roundabout is currently being constructed at the Arroyo de la Miel exit, between kilomtres 222 and 223 of the busy road, as the existing junction has become too congested.
When the police's Tedax bomb squad arrived they decided it was safest to carry out a controlled explosion at the site.