The road forms an important commuter route, connecting Keila and suburban villages to western Tallinn.

Past Keila the route serves truck traffic joining from the T11 heading for the port of Paldiski, connecting to Kapellskär via ferry.

In 2021, the highest traffic volumes were recorded exiting Tallinn, with AADT measured at 15,000, with figures also high around Keila.

[2] Despite this, no plans exist to upgrade the highway, except for a future interchange exiting Tallinn and a potential bypass for Keila.

The highway's follows its original, twisty, 19th century route until Kersalu, with the speed limit dropping to only 50km/h in Kloogaranna.