The slovenian highest mountain road turns off from the main road Bovec – Predel a little less than 2 km from the international border crossing at Predel.

The road was constructed in the year 1938 for the requirements of the Italian military.
The road was completed in 18 months.
Construction took place at four locations simultaneously, throughout the summer and winter.

The road is 11 km long.

It has five tunnels and leads up to a point 2100 metres above sea level.

The present purpose of the road is mainly tourism.

The road is open from the middle of June until November, or until the first heavy snowfall.