Rut tester
Hemmed in by large, black BMW saloons for private hire (their drivers waiting at the petrol station shop) I spy an interesting looking small yellow car.
A search reveals the purpose of the vehicle: the laser devices and lowerable wheels detect ruts in road surfaces. It's proximity to Amsterdam's Schiphol Airport suggest it may have been used to test their runways. Note the large Trimble badged GPS antenna on the roof and the LED warning lamps on the upper tailgate.
An extract from here: www.koac-npc.com/Flex/Site/Page.aspx?PageID=29166&Lan...
"Rutting, or transverse unevenness, is the permanent deformation in the road caused by great repetition of heavy trucks leaving ruts in the asphalt or block paving. Passenger cars experience great hindrance from rutting, because they do not quite fit in the ruts, which influences the steering behaviour of the car. Rutting is hazardous in rainy weather, due to large puddles forming in the tracks, which can cause aquaplaning at high speeds. If the foundation or deeper lying layers become deformed, this becomes visible on the surface in broad ruts with shallow flanks. The higher the deformation in the construction, the narrower the ruts and steeper the flanks.
KOAC•NPC can visually assess the rutting. We can measure the rut depth objectively per 5 m, at normal traffic speeds, using the ARAN (Automatic Road Analyser). Rut depths can be calculated under a 1.20 m beam, in the transverse profile measured over a traffic lane, but so too can water layer depths.
For a more detailed study of the causes of rutting, we take a measurement using the Flatmate. The Flatmate records the road profile over 2.25 m, at the project level. This test is generally combined with sequential drilling for allocation of the source of the deformation."
Rut tester
Hemmed in by large, black BMW saloons for private hire (their drivers waiting at the petrol station shop) I spy an interesting looking small yellow car.
A search reveals the purpose of the vehicle: the laser devices and lowerable wheels detect ruts in road surfaces. It's proximity to Amsterdam's Schiphol Airport suggest it may have been used to test their runways. Note the large Trimble badged GPS antenna on the roof and the LED warning lamps on the upper tailgate.
An extract from here: www.koac-npc.com/Flex/Site/Page.aspx?PageID=29166&Lan...
"Rutting, or transverse unevenness, is the permanent deformation in the road caused by great repetition of heavy trucks leaving ruts in the asphalt or block paving. Passenger cars experience great hindrance from rutting, because they do not quite fit in the ruts, which influences the steering behaviour of the car. Rutting is hazardous in rainy weather, due to large puddles forming in the tracks, which can cause aquaplaning at high speeds. If the foundation or deeper lying layers become deformed, this becomes visible on the surface in broad ruts with shallow flanks. The higher the deformation in the construction, the narrower the ruts and steeper the flanks.
KOAC•NPC can visually assess the rutting. We can measure the rut depth objectively per 5 m, at normal traffic speeds, using the ARAN (Automatic Road Analyser). Rut depths can be calculated under a 1.20 m beam, in the transverse profile measured over a traffic lane, but so too can water layer depths.
For a more detailed study of the causes of rutting, we take a measurement using the Flatmate. The Flatmate records the road profile over 2.25 m, at the project level. This test is generally combined with sequential drilling for allocation of the source of the deformation."