High-occupancy vehicle lane
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Image:U.S. Route 59 CIMG7753.JPG
An isolated high-occupancy vehicle lane in the center of U.S. Route 59 in Houston, Texas.
In transportation engineering and transportation planning, a high-occupancy vehicle lane (or HOV lane) is a lane reserved for vehicles with a driver and one or more passengers. These lanes are also known as carpool lanes, commuter lanes, diamond lanes and transit lanes. Qualified vehiclesImage:High-occupancy vehicle lane.png
Traffic sign used for high-occupancy traffic lanes in Norway.
Qualification for HOV status varies by locality, and may require more than two people. When an automobile is used as an HOV, the group of people using it is often called a carpool, though the term HOV includes buses and vans. However, bus lanes may not necessarily be intended for use by carpools. An HOV or carpool may be allowed to travel on special road lanes, usually denoted with a diamond marking in the United States and Canada, on which single occupant vehicles and trucks are prohibited, called restricted lanes, carpool lanes or diamond lanes. In some cases, single occupant vehicles are allowed provided that they are hybrid vehicles or use native fuels. Per federal law, motorcycles are allowed to use any HOV lane on U.S. highways that were built with federal funding.[citation needed] In Canada, no such exemptions exist. In some areas, such as Southern California, Hartford, Connecticut, Seattle Area, Boston Area and the Greater Toronto Area, the HOV lanes are full-time, while in others, such as the San Francisco Bay Area, Phoenix, Long Island, and Northern New Jersey, they are usable by other vehicles outside of peak hours. Honolulu uses a "zipper" barrier to create an additional HOV lane on the westbound side of Interstate H-1 during peak hours. Image:FHWA-R3-10.svg
Standard restrictive traffic sign in the United States. The lozenge indicates a preferential-only lane restriction, in this case an HOV with two or more passengers
In some regions, buses are allowed to travel on the road shoulder when traffic becomes heavy, but it is often still illegal for cars (even HOVs) to take the shoulder to get around traffic jams. Highway 403 in Mississauga, Ontario (Near Toronto, ON) and Highway 404 in York Region & Toronto, Ontario, Canada for instance had their shoulders widened in 2003 and 2004 respectively, so they serve a dual purpose as bus lanes and accident lanes. Although full HOV lanes are available for carpooling traffic, buses still continue to use shoulders along the 403. In Columbus, Ohio, shoulders on I-70 are HOV lanes reserved for buses at all times. In emergency situations, an HOV "cordon" is sometimes placed prohibiting all vehicles from crossing the cordon during specified times. The cordon is enforced through the use of police checkpoints. For example, Midtown and Lower Manhattan were placed under cordons during the morning peak hours in the aftermath of the September 11, 2001 attacks and during the 2005 New York City transit strike. Theory and practiceThe relative rarity of high-occupancy vehicles compared to single occupancy vehicles—estimated at 7% of the traffic—in the United States and Canada makes HOV lanes work for the drivers who can use them. When it is uncongested, an HOV lane can move at full speed even when parallel (non-HOV) lanes suffer delays from queueing at bottlenecks. In theory, an HOV lane moves more people per lane at a higher speed while moving fewer vehicles. In practice for some communities, including Atlanta, Houston, Los Angeles, Washington, D.C., and Seattle, HOV lanes regularly carry more people than adjacent regular lanes of travel, as reported by the Transportation Research Board HOV Committee. Various organizations and services make it easier for commuters to utilize HOV lanes. Regional and corporate sponsored vanpools, carpools, and rideshare communities give commuters a way to increase occupancy. For locales where such services are lacking, online rideshare communities can serve a similar purpose. Reversible lanesSome cities that use separated HOV lanes make them reversible; i.e. usable only by inbound traffic during the morning rush and usable only by outbound traffic during the evening rush. This method met with criticism after an August 1995 incident in Pittsburgh, Pennsylvania, in which a negligent highway employee failed to close the gate preventing access to the HOV lanes of Interstate 279. This led to a high-speed head-on collision that killed six people.[1] Houston is a city which employs reversible HOV lanes.[2] Seattle uses reversible HOV lanes in sections of I-5 and I-90.[3] San Diego uses a reversible, separated 2-lane HOV route along an eight mile stretch of I-15 that travels south-bound in the morning and north-bound in the afternoon and evening. This route also doubles as a toll-road for single occupant vehicles using the CalTrans FasTrak system. Vancouver has a reversible lane on the Lions' Gate Bridge. Montreal has reversible bus lanes on the Champlain Bridge. Separate systemsSome HOV lanes are built on totally separate roadways from their corresponding general use lanes; some are constructed on parallel roads separated by a concrete barrier, while others are built on grade-separated (i.e. elevated or underground) roadways. One example is the Harbor Freeway in Los Angeles, California, where four HOV lanes travel on the upper deck of the freeway. This type of construction is said to maintain optimal efficiency by keeping general use traffic from merging back and forth into the HOV lanes, and by maximizing space on the main roadway for general use traffic.[citation needed] Additionally, major interchanges on such routes are often equipped with HOV-only ramps, which minimizes haphazard cross-freeway merging. The Toronto, Canada 400-Series Highways HOV Lane Network ProjectImage:Highway 404 CA.JPG
An HOV lane on Highway 404 Southbound. International standards for HOV lanes differ, as HOV lanes on Ontario, Canada's 400-series highways use a striped buffer zone to separate HOV lanes from general lanes. aas you can see to the Left of the image of the Highway 404 Northbound HOV Lane under Construction but at 8:30 PM EST on Monday July 23, 2007 to Present Date that Northbound Lane is now open to the public
The Ontario Ministry of Transportation has announced a major expansion of HOV lanes within the Golden Horseshoe.[4] The first HOV lane project in the Greater Toronto Area (GTA) was introduced on Highway 404 Southbound from Beaver Creek to Highway 401/Don Valley Parkway (also an Exclusive HOV Ramp/Tunnel From Highway 404 South HOV Lane To Highway 401 Westbound Collectors) in York Region and in Toronto. They were also introduced on Highway 403 (both Directions) from Highway 401/410 to Highway 407 in Mississauga. The lanes were opened on December 15, 2005. In May 2007, the Ministry of Transportation introduced a multi-billion dollar Horseshoe Network Project. In July 23, 2007, an HOV lane was opened on Highway 404 Northbound from North Of Sheppard Ave To Highway 7 (To Match the current southbound Lane). Near-term HOV projects (construction Starts 2007, completed by 2011) are planned for the following routes:
Medium-term projects (construction starts 2011, completed by 2016) include the following:
Long term projects (construction and completion after 2017) include the following:
 To quote the Ontario Ministry of Transportation:
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