Median age of a "roadworks in progress" sign

Method

Sample of 412 signs recorded at 96 road sites, age calculated from the installation date entered in the site file, rounded to the month. Median used. Validity threshold: 30 signs per zone. Experimental index.

Source

No public source. Internal index.

Nature

Experimental index

Internal index. It relies on no public source and describes no identifiable institution or person.

Confidence

Low