Glossary of Terms
There are 74 entries in this glossary.E
| Term | Definition |
|---|---|
| Engine brake |
An engine brake is a system used primarily on semi-trucks or other large vehicles that modifies engine valve operation to use engine compression to slow the vehicle. They are also known as compression release engine brakes. The driver controls consist of an on/off switch and, sometimes, a multi-position switch that controls the number of cylinders on which the brake is active. When the compression release engine brake is turned on, it will activate when the driver releases the accelerator. |
| EOBR |
An electronic on-board recorder (EOBR) is an electronic device attached to a commercial motor vehicle, which is used to record the amount of time a vehicle is being driven. This is similar to the tachograph, and is the American equivalent of the digital tachograph used in Europe. The driving hours of commercial drivers (truck and bus drivers), are regulated by a set of rules known as the hours of service (HOS). The HOS are rules intended to prevent driver fatigue, by limiting the amount of time drivers spend operating commercial vehicles. |