The A4 highway is a highway in Lithuania (Magistralinis kelias). It runs from Vilnius to the Belarus border, near Druskininkai. From there the road continues to Grodno as 
P 42. The length of the road is 134.46 km.
Most of the road has one lane per each direction and default 90 km/h speed limit. It is the main road connecting Vilnius with the Dzūkija region.
