Glossary of Terms
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 August, 2018. If you have suggestions for future additions, please contact us.
Title |
Description |
|---|---|
| HCM |
Highway Capacity Manual. An engineering reference manual for road design. |
| HCR |
High Capacity Road |
| HGV |
Heavy Goods Vehicles. Typically refers to trucks over 3.5 tons |
| HMI |
Human-Machine Interface. A front-end user interface. |
| HOT |
High-Occupancy Toll Lanes: HOT lanes are Priced Managed Lanes that use price, occupancy, and access restrictions to manage the number of vehicles traveling on them, thereby maintaining free-flow traffic conditions, even during peak travel periods. Typically, qualifying HOVs may use these limited-access highway lanes for free or at a reduced cost. Motorists in vehicles that do not meet passenger occupancy requirements may choose between the general-purpose lanes or paying for premium conditions in the HOT lanes. |
| HOV Lanes |
High Occupancy Vehicle lanes. Lanes typically reserved for vehicles with two or more occupants. |
| Hub |
Or “Clearinghouse Hub”, is a node on the Clearinghouse Network, interfaces to all other Hubs on the Clearinghouse Network. |