As with any other road asset, the costs of any WIM system can be expressed in terms of the life cycle costs consisting of: initial capital cost (in-road WIM equipment, installation labour and materials, initial calibration and traffic control) and maintenance or on-going costs (labour and materials, traffic control and system recalibration). Roadside cabinets, WIM electronics, power and communication costs need also to be included with their initial and ongoing costs.
It is difficult to be definitive on the costs of individual WIM systems. In 2010 VicRoads supplied some indicative costs as shown in the table below. The cost estimates were for one lane of traffic.
Table: Indicative costs of WIM technologies
|WIM system name||Indicative sensor + cable cost $||Indicative equipment cost $||Indicative installation and calibration labour
|Strain gauge (e.g. ARRB Culway)||$14K per lane||$20K||8||Four MSA and Signal Conditioners per lane|
|Bending plate (e.g. PAT DAW 100)||$30K per lane||$14K||6||2 plates needed per lane|
|Quartz piezoelectric cable (e.g. ARRB Express-weigh using Kistler Lineas||$20K per lane||$25K||2||2 strips
(4 modules per lane)
|Capacitance pad (e.g. Mikros Systems capacitance HSWIM system)||$30K per lane||$25K||6||2 pads needed per lane|
The suppliers listed in useful website links should be able to provide detailed quotes on various WIM systems.
It is also recommended that agencies keep a database or registry of their WIM sites including site:
- number, location, number of lanes
- WIM technology type
- installation date
- date of initial calibration and link to calibration report (e.g. File No.)
- date of subsequent calibrations and link to calibration report
- maintenance information: refurbishment what and when
- pavement and surfacing works at the site and approaches: what and when.