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Live incidents on this corridor
Live road incidents
A21 Wiener AussenringActive traffic disruptions on A21 Wiener Aussenring, refreshed every 15 minutes from official DATEX II feeds.
Map of active incidents. Colours: red = severe, orange = moderate, green = minor.
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Machine-readable feed: /data/incidents-at.json (JSON, refreshed every 15 min)
Peak traffic hours
Weekdays: 06:30-09:30 and 16:00-19:30 in both directions, Vienna Woods commuters
Holiday periods: Summer Saturday transit (Adriatic-bound German tourists using A1-A21-A2), winter ski transit Vienna-Carinthia
Incident pattern on the A21
Knoten Steinhauserl A1 junction backups, Pressbaum tunnel single-tube sections, Knoten Vosendorf with A2 saturated, narrow Vienna Woods alpine sections.
Alternative routes
- Through-Vienna via A22 + A23: Cross Vienna via Donauufer and Sudosttangente; usually more congested but real alternative when A21 is closed for incidents.
- B1 Wiener Strasse + B17: Free parallel state roads; very slow but useful when A21 closes.
2026 construction outlook
- Pressbaum tunnel safety upgrades continuing
- Knoten Steinhauserl modernization
- Vienna Woods autobahn sound barrier installation
Practical tips
- A21 is heavily used by transit traffic on summer Saturdays; expect alpine-section slowdowns
- Vienna Woods sections winter: snow chains can be required after heavy snowfall
- Vignette required; same as elsewhere
Frequently asked questions
Why is the A21 between Vienna outer ring (Knoten Steinhauserl and Knoten Vosendorf) congested?
Vienna outer bypass, transit traffic between A1 and A2, Vienna Woods commuter axis. The corridor passes through Lower Austria, Vienna and serves Steinhauserl, Pressbaum, Voesendorf. Annual cumulative stau: 65,000 km (ADAC Stauatlas 2024 dataset).
When are the worst traffic hours on the A21 in 2026?
06:30-09:30 and 16:00-19:30 in both directions, Vienna Woods commuters. Summer Saturday transit (Adriatic-bound German tourists using A1-A21-A2), winter ski transit Vienna-Carinthia.
What alternative routes can I take to avoid the A21?
Through-Vienna via A22 + A23: Cross Vienna via Donauufer and Sudosttangente; usually more congested but real alternative when A21 is closed for incidents. B1 Wiener Strasse + B17: Free parallel state roads; very slow but useful when A21 closes.
Are there ongoing roadworks on the A21 in 2026?
Currently scheduled major works on this corridor: Pressbaum tunnel safety upgrades continuing Knoten Steinhauserl modernization Vienna Woods autobahn sound barrier installation