LaneAustria
1. Lane
A lane is a longitudinal part of a roadway intended to accommodate a line of moving vehicles. A roadway may contain one or several lanes for traffic travelling in the same or opposite directions.
Lanes are commonly separated by continuous or broken road markings. Traffic signs, lane arrows and lane-control signals may indicate which vehicles may use a lane, which direction traffic must follow or whether a lane is open or closed.
Must an Austrian lane change be signalled?
Yes. Signal clearly and early enough for other road users to adjust.
Can an Austrian lane change endanger or obstruct other road users?
No. Check that it can be completed without either before moving across.

Traffic rules
Austria