Unstaffed, or actually gone? :)

Last time I drove into Austria from Germany there were no border guards there to actually check anything, but all the traffic calming measures, warning signs and speed restrictions were still there ("cars use left-hand lane, larger/freight vehicles right hand lane").

As one might expect from Homo sapiens behind the wheel, the frantic changing of lanes by vehicles approaching the (unmanned) checkpoint caused an enormous queue and resulting delay almost as bad as if there had been border guards actually checking every single vehicle.

Locals avoid it whenever possible, even thought this is the most direct way for many connections.

Avoid taking a bus over that border, and if you do don't panic when they enter with dogs and machine guns and expect a 2 hour delay