Tangente Neu – Asfinag continues modernization of the A23

Tangente Neu starts in 2020 with the St. Marx elevated road

It is almost three kilometers long and leads over 32 bridges through the third, tenth and eleventh districts: the St. Marx elevated road. Originally built in the 1970s and designed for around 45,000 vehicles a day at the time, it now carries almost five times as much traffic. So that the elevated road, which leads from the “blocked Simmering exit” to the Prater junction, will continue to meet the high demands of the future, construction site work will begin on Monday, March 9th. Three major construction phases will be carried out in 2020. ASFINAG is investing 126 million euros in all-round renewal.

The St. Marx elevated road will be completely renovated by 2022. To be renewed:

  • 32 bridges
  • 10 ascents and descents
  • 2 connection points (Gürtel and St. Marx)
  • 400 lighting fixtures
  • 150,000 square meters of lane (= 37 soccer fields)

In addition to the elevated road itself, ASFINAG renews and increases noise protection along the Kaisermühlen directional lane to protect the approximately 15,000 residents. The existing “blocked Simmering exit” is partially demolished and converted. It is then only available to the emergency services (ASFINAG and blue light). At the belt junction, ASFINAG also widened the A 23 by a breakdown strip.

track locks

Basically, all lanes remain open during the day during the construction work on the main carriageway of the A 23. Depending on the construction phase, the lanes are swiveled to the left and right, guided in oncoming traffic or guided past the construction site on both sides. With two exceptions:

  • In the area between the ascent and descent of the Gürtel junction, a lane must be blocked for around three days in both directions during the day. A second at night. ASFINAG provides timely information. The reason for this is the manufacture of a guide wall at the edge of the road using a special device – i.e. a concrete guide wall from a single cast. A concrete baffle manufactured in this way cannot be moved even under extremely high loads. This type of protection is necessary because parts of the bridge are broken off directly behind the concrete baffle for the widening
  • However, for the duration of the construction work – until 2022 – the lane on the bypass bridge in the Prater node in the southbound direction remains blocked. The traffic runs exclusively over the three lanes of the main lane on the Erdberger bridge. The exit to the A 4 Ostautobahn remains unimpeded. It is also possible to drive from the Lände onto the A 23 to the south.
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Gürtel and St. Marx: blocking entrances and exits

  • For the renovation of up and down ramps, the ramps affected are blocked for one month at the belt and two months at St. Marx. The longer blocking period at St. Marx results from the length of the bridges at the junction
  • ATTENTION: The inner ramp from the Gürtel to the tangent northwards will be closed to traffic for the duration of the construction work from the beginning of November until the end of 2022. All traffic coming from the Gürtel on the A 23 northbound is led via the so-called outer belt ramp.

Color guide concept: More overview at a glance

Changing lanes can lead to confusion and traffic jams, especially in the first few days. ASFINAG relies on a color coding system so that drivers have a good orientation within the construction site. Three colors will accompany you through the construction site until 2022:

  • BLUE for the long-distance destinations towards the south: Graz and Linz – towards the north for Praha, Brno and Budapest as well as for the destinations Zentrum and Erdberg
  • ORANGE shows the way to the Gürtel junction
  • TURQUOISE stands for the St. Marx junction

The focus is on traffic safety. Therefore, a speed of 60 km / h applies throughout the construction phase. A multi-section control monitors the permitted maximum speed both on the main lane and on the ascents and descents. Placement in traffic on the construction site is greatly supported if the zipper principle is adhered to. Incidentally, work is also carried out on the St. Marx elevated road in winter. The construction site will be moved to allow the snow to be cleared if necessary.

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Kaisermühlen node: from 2021 a completely renovated “roundabout”

ASFINAG has been working on the general renewal of the Kaisermühlen node since 2019. The Kaisermühlen junction connects the Tangente with the A 22 Donauuferautobahn, Raffineriestraße and Donaustadtstraße. He drives over 150,000 cars every day. On April 15, ASFINAG will continue to work. There will be four major construction phases this year. Overall, the renovation will take until the end of next year. ASFINAG is investing EUR 30.2 million in this.

To be renewed:

  • 10 bridges
  • 11 overhead signposts
  • all ascents and descents in the node
  • 350 lighting fixtures
  • 58,000 square meters of lane (= 8 soccer fields)

Block lanes and entrances and exits

Basically, all lanes remain open during the construction work in the Kaisermühlen node on the A 23.

  • The lanes are swiveled to the left or right.

There is one exception:

  • Coming from the north, only two instead of three lanes will be available from Stadlau to the Ölhafen / Lobau exit in 2020.

In summer, ascent and descent must be blocked on a total of four weekends. Local diversions will be set up. ASFINAG provides timely information.
ASFINAG appeals to ensure that the traffic remains smooth despite the narrower lanes and shorter lanes for classification when driving up and down
to be observed and to apply the zipper principle. Because unnecessary braking or evasive maneuvers are dangerous and often lead to backwater. A speed of 60 km / h applies to the entire node area during construction.

2020 will work in the Kaisermühlen node until the end of November. The construction site is dismantled in winter. The final renovation year 2021 then starts again in spring.

The Praterbrücke gets a new carriageway crossing

From April 6 to the end of May at the latest, ASFINAG will exchange a carriageway crossing on the Prater Bridge. The work area is located exactly above the Danube Island. Work in the direction of travel north (Stadlau) is done exclusively at night. During the day, the open construction site is covered with a special construction and the traffic can drive without lane closures. ASFINAG is investing 3.5 million euros in new carriageway crossings on the Prater Bridge.

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The traffic is running – despite the open construction site

Thanks to the use of this innovative, foldable special construction, there is no need for long construction site barriers, lane locks during the day and time-consuming changes to the lanes. The clear advantage: shorter construction time and therefore fewer disabilities. In the previous year, the same work in the direction of travel south was completed 1.5 months earlier than with conventional processing. The construction covers the open construction site during the day. It consists of three steel plates that can be opened and lowered in lanes using a loading crane. The function is similar to opening a drawbridge. The plates are connected to each other with joints and are therefore movable. If the construction site is covered during the day, the construction to be driven over is seven centimeters high at its highest point.

Track barriers at night

During the construction work, two lanes are blocked every night from 10 p.m. and a third one from midnight. From midnight until 5 a.m. at the latest, only one lane north on the Prater Bridge in the construction area remains open to traffic. The speed is 60 km / h.

This requires lane crossings

Road transitions form the connection of “solid” roadways with bridges. They are made of steel and have to be replaced regularly. These transitions give the bridge the opportunity to “move”. Both vibrations caused by traffic and weather-related influences – the material contracts in winter and expands in summer – lead to movements. The exchange of these transitions is necessary to maintain the mobility of bridges and thus protect the bridge from damage.


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