Weigh-In-Motion (HSWIM)

Weigh-in-Motion stations record axle weights as vehicles drive over the stations at normal traffic speeds. The information gathered from these stations is used for pavement design, monitoring and research.

At Traffic and Load Control Centres, WIM stations are used to screen Heavy vehicles for weighing at weighbridges. As part of a Comprehensive Traffic Observation (CTO) system, WIM stations assist monitoring, design and planning of road networks and infrastructure.

With the development of our own in-house electronic logger equipment to process bending plate signals, TES is able to provide clients with competitively priced Weigh-In-Motion survey stations.

TES has successfully deployed the following:

  • WIM stations on the N3 Route for N3TC;
  • Bakwena N1 and N4 Toll Roads for many years;
  • The CTO contract for the Gauteng Provincial Government’s Department of Transport Roads and Works;
  • WIM station in Nigeria as part of the LCC Toll road project on Victoria Island, Lagos; and screener WIMs at the Matola, Boane and Pessene Load Control Centres in Mozambique;
  • WIMs at the Mariakani, Gilgil, Athi River and Webuye Load Control Centres in Kenya.
  • BKS was the independent quality engineer on the BPCC WIM Project and TES has been fortunate to participate in the world leading statistical analysis research and development into WIM data quality control as was continuously being advanced by the late Dr Martin Slavik, BKS Associate, and Gerhard de Wet, Chief Transport Engineer.

    TES has recently accredited our Traffic Monitoring Systems according to the TMH 3 and 14 Specifications as set out by the South African Committee of Transport Officials (COTO). Agrément SA along with the CSIR have been used to facilitate the accreditation process and verifying of results, ensuring that our equipment complies with all requirements. TES conducts the complete installation and maintenance of WIM stations and have been doing so for more than 20 Years, starting on the WIM projects for the N3TC and BPCC. Data analysis and reports are world leading and can accommodate most of our clients’ needs with regards to classification and report formats.

    As TES is skilled and experienced in integrating systems, we are currently in the process of integrating various equipment such as cameras, optical character recognition, radio tagging of vehicles and remote connectors to deliver a complete Remote WIM site as well as stock and loading control at mines and resource industries, where TES will also be able to provide the software management systems for such projects.

    Axle Load Surveys

    Axle load surveys provide average pavement loading information which facilitates authorities and civil companies in road management and pavement design. They are essentially useful for locations where no loading data is available.

    An axle load survey comprises of the manual capture of vehicle weights using portable weigh scales under low speed conditions. In addition, one 12-hour manual survey and one 7-day electronic loop survey is required to complete the axle load survey. All information combined and processed enables the calculation of average pavement loading results.

    These surveys are conducted on most roads where busy roads such as National routes require assistance from relevant traffic authorities. Heavy vehicles are stopped, axle-spacings are measured and then required to travel over the portable weigh scales at slow speed for loading measurements. Axle load surveys can be used in other industries such as mining and logistical transport where the survey methodology can be modified to accommodate clients’ needs.