Swiss road traffic census

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The Swiss Road Traffic Census (SSVZ; French Comptage de la circulation routière en suisse CSCR , Italian Censimento svizzero del traffico stradale CSTS ) is operated by the Federal Roads Office .

The first nationwide road traffic censuses took place in 1928/29, then in 1936/37 and then in 1948/49. Since 1955, these so-called category and origin censuses have been carried out at five-year intervals on the recommendation of the European Inland Transport Committee of the UN .

execution

Currently, traffic in around thirty countries is recorded according to uniform guidelines and terms. This enables a comparison of the load levels, the heavy freight transport share and the traffic development across Europe. The link with various infrastructure data gives an overview of the utilization of the individual European thoroughfares.

In Switzerland, these UN counts are part of the Swiss Road Traffic Census (SSVZ) . The censuses are organized by the Federal Roads Office (FEDRO) and the cantonal civil engineering offices . The extensive figures are electronically recorded by the Federal Office for Information Technology and Telecommunications (FOITT).

methodology

The measuring point network of the SSVZ 2005 comprises 453 counting points. At 175 counting points, the automatic traffic counting devices from the network of automatic road traffic counting (AVZ) are used, which are now able to assign the vehicles to the corresponding vehicle categories. The counting staff at 134 locations is supported by electronic devices for recording passenger cars. At the remaining 144 counting points, which are mainly on main and secondary roads with little traffic, all vehicle classes are counted manually. Compared to previous counts, around 80% of the traffic can be recorded automatically. The personnel expenditure on the counting days is reduced from around 2000 to around 600 people.

The automatic counting devices are in use all year round, the manual surveys are based on a sample concept. All manual counting stations count simultaneously on 3 working days for 6 hours and on 2 Sundays for 4 hours. These counting days are spread over the whole year. The random samples determined in this way are extrapolated using the daily and vintage lines of the automatic recording devices used.

The survey of foreign vehicles is a specialty: In order to determine their share of the total traffic, the foreign vehicles are recorded separately by manual counts at 27 automatic measuring points.

Weight recording (WIM)

FEDRO currently operates eight systems on the national road network in cooperation with the cantons for recording vehicle axle loads while driving. The WIM is W eigh I n M otion.

With WIM systems, the total weight, axle loads, axle distances, vehicle category, speed, vehicle length and time gaps can be recorded and statistically evaluated for each individual vehicle. The results are used for dimensioning roads and engineering structures, maintenance planning, safety, economy, transport studies, research (e.g. engineering structures) and other traffic-related purposes. In addition, the systems are also used by the police for pre-selection during heavy traffic controls.

Automatic road traffic counting (SASVZ)

The Federal Roads Office has maintained a network of permanent automatic traffic counting stations on the most important road connections since 1961 . By the end of 2009 , their number had risen to around 330.

Methods

The goal is a complete recording of the traffic according to direction and time (hours). Are evaluated u. a. the two characteristic values ​​DTV and DWV:

  • Average daily traffic (DTV)

With average daily traffic, the mean value of the 24-hour traffic is calculated from all days of the year. For roads closed in winter, this recording is calculated for the opening period.

  • Average daily traffic (DWV)

With average weekday traffic, the mean value of the 24-hour traffic is calculated from all working days (Monday - Friday) with the exception of public holidays. The same calculation method applies to roads with winter closure as for DTV.

execution

  • Data acquisition: the vehicles are detected with induction loops integrated into the roadway and associated recording devices.
  • Data transfer: takes place daily through an automatic query system
  • The data is validated in three steps: daily, monthly and annual processing.

Specials & Diffusions

The processed data is published monthly and annually in the form of bulletins. The separate annual report AVZ has also been available on CD-ROM since 1997. Further values ​​are determined from this data: period results, hydrographs, mean values ​​(daily, monthly, yearly, periodic), peak values.

Web links