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Airline Weekly

Airline weekly

Airline Weekly, which began operations in 2004, is an industry publication that covers international airline news and provides analysis about the industry and its finances in the context of related influences, such as government regulation and world events. The company charges for annual subscriptions, but access to its [http://www.airlineweekly.com website] is free. The website includes airline and airport news, job listings, and a Question of the Week about a topic impacting the airline industry. Airline Weekly publishes 48 editions per year, each week except the last week of August, the first week of September, and the first and last weeks of the year. Airline Weekly Corp. is headquartered in Fort Lauderdale, Florida.

External Links

[http://www.airlineweekly.com Airline Weekly]

High occupancy vehicle

]] A high occupancy vehicle (or HOV) is a transportation engineering and transportation planning term referring to a vehicle with a driver and one or more passengers. Qualification for HOV status varies by locality, and may require more than 2 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, on which single occupant vehicles are prohibited, called carpool lanes or diamond lanes. In some cases, single occupant vehicles are allowed provided that they are hybrid vehicles or use alternative fuels. In some areas, such as Southern California, the HOV lanes are full-time, while in others, such as the San Francisco Bay Area, they are usable by other vehicles outside of peak hours. The relative rarity of high occupancy vehicles to single occupancy vehicles - estimated at 7 percent 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. Proponents of HOV lanes say that this is a good return on the laws, paint and signs that implementing an HOV lane requires. Additionally, a single engine carrying multiple passengers uses less fuel per trip, saving money and creating less pollution than if each passenger drove their own car. In other words, HOV lanes are supposed to encourage people to carpool or take public transit that utilizes the HOV lane. In practice, however, the proximity of a slowly moving lane adjacent to the HOV lane and occasional merging slows HOV traffic and thus makes them less efficient than theory would suggest. Multiple or separated HOV lanes can be used to address these issues, at significant costs in terms of space. In order to accommodate the 7 percent of traffic that is eligible to travel in an HOV lane, a typical HOV lane consumes 25 percent of the capacity on a four-lane freeway. The net effect overall may be an increase in traffic congestion if the HOV lane was formerly a regular lane. Likewise, adding HOV lanes to a freeway also means that congestion is not reduced as effectively as it would have been if regular lanes were added. pollution One symptom of HOV lanes that refutes the above contentions has been the slugging phenomenon of the Washington DC metro area. "Slugging" is the term used to describe a unique form of commuting where drivers go to pre-arranged "slug lines" and pick up commuters who need a ride. The driver shouts out his destination, and people in the line going to that destination enter the car in a first come first serve basis. There is very specific etiquette to the system to ensure a fair, consistent, and agreeable commute for all. Slugging benefits drivers by enabling them to use the HOV lane, benefits "sluggers" by getting them rides, and benefits the community by decreasing the number of cars on the road. It however also carries most of the risks and problems of hitch-hiking. Many 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 of such a situation is the Harbor Freeway in Los Angeles, California, where four HOV lanes travel on the upper deck of the freeway. This type of construction maintains 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. Additionally, major interchanges on such routes are often equipped with HOV-only ramps, minimizing haphazard cross-freeway merging. Most 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. Some say this is a space-economical method of handling high HOV traffic. Critics of this method believe it is a potential safety hazard, and these critics often cite a 1995 incident in Pittsburgh, Pennsylvania, when 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. Opponents say that at the critical point when heavy traffic is about to become a traffic jam, the loss of the HOV lane from general use actually precipitates the traffic jam, making its usefulness a hollow victory. They also question how much ride-sharing they actually encourage, instead of merely advantaging those who would be sharing a vehicle anyway. HOV lanes added to existing highways also create more congestion at exits and interchanges because often no HOV-only exits are provided; the normal central position of the HOV lanes means that vehicles must transition across all lanes of traffic in a short distance to exit. Some departments like Caltrans have started building special direct ramps so HOV lane users can change freeways or directly enter and exit the HOV lane without having to merge across all lanes, but these ramps and flyovers are built at great expense. Caltrans Because HOV lanes seldom maximize vehicle throughput, a number of cities are considering converting under-utilized HOV lanes to high occupancy toll (HOT) lanes. This would permit single occupant vehicles to buy the right to use the HOV lanes for a toll, but total flow would be regulated (the price would be varied) to ensure total speeds on the HOV lane do not drop noticeably. 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 highly-occupied ones) to take the shoulder to get around traffic jams. Highway 403 near Toronto, Ontario, Canada for instance had its shoulders widened in 2003 so they serve a dual-purpose as bus lanes and accident lanes.

See also


- Bus rapid transit
- Toll road
- Public transit
- Bus lane

External links


- [http://www.bizjournals.com/sacramento/stories/2001/08/20/editorial4.html Carpool lanes have flopped]
- [http://www.jewishworldreview.com/1003/saunders100803.asp Diamond lanes are forever ]
- [http://www.paloaltodailynews.com/diamond/121902.html Diamond lanes leading to nowhere]
- [http://www.scienceservingsociety.com/p/145.htm Get rid of diamond lanes]
- [http://republican.sen.ca.gov/web/mcclintock/iss_trans_diamond.asp Transportation: Diamond Lanes] Category:Road transport Category:Ecology

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