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Beginning this month, researchers at the Virginia Tech Transportation Institute (VTTI) will use a Volvo VHD 430 vocational model outfitted with highly specialized instrumentation to help evaluate the safety of highway surfaces in several U.S states. The project, funded by the Federal Highway Administration, will analyze continuous stretches of pavement to determine whether improving highway materials or design could reduce crashes and save lives.
"We are proud that VTTI and its partners selected a Volvo truck for this safety research," said Gӧran Nyberg, president of Volvo Trucks North America. "Volvo is committed to safety as a core value. The Volvo VHD model is an appropriate choice because it is easily upfit with specialized bodies such as this one."
In addition to a passion for safety, Volvo and VTTI share a southwest Virginia location. VTTI is located only about 25 miles from Volvo's New River Valley assembly plant in Dublin, Virginia, where VHD models are built, but it was the United Kingdom-based company that installed the body and instrumentation that recommended Volvo as the truck supplier based on past experience with Volvo on projects elsewhere. W.D.M. Limited is the sole supplier of the highway measurement technology - called the Sideway-force Coefficient Routine Investigation Machine (SCRIM) - and has used Volvo chassis in other countries frequently over the years.
"We have found Volvo's build quality to be superior," said Richard Dal Lago, W.D.M's head of electro-mechanical development. "Also, Volvo's strong reputation for safety makes it a natural choice for such a project."
W.D.M. purchased the Volvo VHD 430 model in 2014 and shipped it to the UK for the necessary instrumentation, which required several months and included interior cab modifications as well as a special truck body. The VHD 430 model used for the VTTI project features an integrated powertrain with a Volvo D13 engine and a Volvo I-Shift automated manual transmission.
The data collection phase of the research project begins in July in Florida and will include testing of highways in Washington, Indiana and Texas. Researchers with VTTI's Center for Sustainable Transportation Infrastructure will use the specially equipped VHD 430 model to measure pavements for friction and related safety characteristics, such as cross-slope, macro-texture, grade, temperature and curvature.
The SCRIM includes a 2,000-gallon tank that feeds a 0.5 mm film of water for testing the friction of wet pavement surfaces while driving at speeds up to 50 mph. The vehicle can test 150 miles of highway on a single tank of water. Current vehicles used for such testing in the U.S. rely on smaller tanks that would cover just a fraction of that distance before needing to be refilled if they were to test at similar intervals.
The SCRIM uses a special tire to analyze road friction continuously without locking the tire as other testers do. This feature is important because continuous application gives a complete friction profile of the pavement surface and additionally simulates today's antilock braking systems better than a locked-wheel skid tester, said Edgar de León Izeppi, senior research associate for VTTI's Center for Sustainable Transportation Infrastructure.
Continuous testing and more sophisticated instrumentation will provide more data on factors that are believed to be linked to the frictional properties of the pavement-tire interface, which should lead to improved highway safety, de León Izeppi said.
"If we can detect the problems we can find a way to solve them," de León Izeppi said. "Most state highway agencies already maintain comprehensive databases on the types and locations of crashes, so by cross-referencing those databases with the detailed road assessments, we hope to be able to identify measures that could reduce crashes and save lives at locations that have a higher risk characterization."
VHD 430 SCRIM on road VHD 430 SCRIM interior
VHD 430 SCRIM interior VHD 430 SCRIM parked
(top left) Virginia Tech Transportation Institute will use a specially equipped Volvo VHD 430 model - also known as the Sideway-force Coefficient Routine Investigation Machine (SCRIM) - to evaluate friction on roadways to determine whether highway improvements could reduce crashes. (top right) The sleeper compartment of the Volvo VHD 430 serves as the information hub, gathering data from various sensors and an in-cab video camera and matching it with satellite positioning data. One technician controls and monitors the instrumentation by laptop while another drives. (bottom left) A key feature of the SCRIM is a special tire housed within the truck's body that collects data. The blue nozzle in front of the tire sprays water from a 2,000-gallon tank. (bottom right) The Volvo VHD 430 chassis was shipped to the U.K. for installation of the body and instrumentation by W.D.M. Limited, which builds such vehicles for customers worldwide. W.D.M. recommended using a Volvo truck for the project based on its experience in Europe with Volvo's build quality and safety.
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