IBTTA’s transportation Glossary of Terms is an ever-changing list of terms used within the transportation and tolling industry.
The Glossary was updated in March, 2016. If you have suggestions for future additions, please contact us.
Highway Capacity Manual. An engineering reference manual for road design.
High Capacity Road
Heavy Goods Vehicles. Typically refers to trucks over 3.5 tons
Human-Machine Interface. A front-end user interface.
High Occupancy Toll (HOT) lanes are High Occupancy Vehicle (HOV) lanes that also allow access to low occupancy vehicles if drivers pay a toll. It is a type of managed lane. This allows more vehicles to use HOV lanes while maintaining an incentive for mode shifting and raising revenue. HOT lanes are often proposed as a compromise between HOV lanes and Road Pricing.
High Occupancy Vehicle lanes. Lanes typically reserved for vehicles with two or more occupants.
Or “Clearinghouse Hub”, is a node on the Clearinghouse Network, interfaces to all other Hubs on the Clearinghouse Network.