| Glossary Word | | Glossary Description | | |
| Railtrack | | The authority responsible for the provision and maintenance of railway lines in Great Britain. |
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| Rat runs | | Routes on unsuitable minor roads used by drivers to avoid delays on the main roads. |
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| Rear-drag Reduction Device | | An addition to the rear of the trailer that is used to reduce aerodynamic drag. There are several different types, but a standard rear drag reduction device is usually an addition to the rear sides and possibly top of the trailer that fan in slightly towards the back door(s). A boat tail fairing is a large rounded addition to the rear of the trailer that covers the entire back side. |
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| Reflashing (Chip Reflashing) | | Reflashing involves reconfiguring the engine control chip with new software that recalibrates the tractor engine. This recalibration is meant to lower nitrogen oxide (NOx) emissions by slightly modifying the combustion parameters within the engine. This strategy applies to certain engines built by seven different engine manufacturers (Caterpillar, Cummins, Detroit Diesel, Mack, Renault, Navistar/International & Volvo) between the years of 1993 and 1998. Please note that as of March 2004, the California Air Resources Board (CARB) has mandated the reflashing of medium and heavy duty diesel vehicles in the state of California, on a phase-in schedule, at no extra cost to the vehicle owner. |
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| Refrigerated Carriers | | Truckload carriers designed to keep perishables good refrigerated. The food industry typically uses this type of carrier. |
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| RES | | Regional Economic Strategy. |
