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Barrier transfer machine
A barrier transfer machine, also known as zipper machine or road zipper, is a type of heavy vehicle that is used to transfer concrete lane dividers, such as Jersey barriers, in order to relieve traffic congestion during rush hours. Many other cities use them temporarily during construction work. The lanes created by the machine are sometimes referred to as "zipper lanes".
One advantage of barrier systems over other lane management treatments such as traffic cones or overhead directional lights is that a solid, positive barrier prevents vehicle collisions due to motorists crossing over into opposing traffic flow. A disadvantage is that lane widths can be slightly reduced.
The Road Zipper variant has been in existence since 1984–1985. [citation needed] Auckland Harbour Bridge had its original moveable barrier system installed in 1990. The Hawaii Department of Transportation debuted a zipper Lane on Oahu on August 18, 1998. The Benjamin Franklin Bridge has had a permanent barrier transfer system since 2000, when it was installed by the Delaware River Port Authority. A movable barrier system was introduced in Sydney, NSW, Australia, in 2012. The Golden Gate Bridge had a permanent 13,340-foot (4,070 m) movable barrier system installed in January 2015.
The vehicle contains an S-shaped, inverted conveyor channel in its undercarriage which lifts the barrier segments (which may weigh over 1,000 pounds (450 kg)) off the road surface and transfers them over to the other side of the lane, reallocating traffic lanes to accommodate increased traffic for the currently dominant (peak) direction. These barriers are linked together with steel connectors to create a sturdy but flexible safety barrier.
The minimum length for some barrier systems is 100 feet (30 m). The length can vary based on application and the amount of barrier needed to effectively deflect an errant vehicle.
Some barrier systems have four rubber feet on the bottom of each segment “to increase the coefficient of friction between the barrier element and the road surface”. This helps the barrier resist vehicle impact and keeps the barrier from moving significantly if struck.
Barrier transfer machines can typically move their barrier segments anywhere between 4 and 24 feet (1.2 and 7.3 m) in one pass, usually at a speed between 5 and 10 miles per hour (8.0 and 16.1 km/h). Some models of the machine hold 50 feet (15 m) of barrier at a time as they are engaged in transferring. The machine can transfer within the regular traffic flow without hindering other vehicles:
Admirably engineered, the barrier-moving process does not compromise traffic flow in either direction, and the truck is shielded by the blocks it's moving. If you're traveling in the same direction as the truck, the lane it's working behind is already blocked. And if you pass the vehicle at the speed limit, you can safely move into the lane ahead of it. Oncoming motorists, meanwhile, are prevented from entering the zipper's lane by the concrete barriers in front of it, and they can move into a lane after they have passed the truck.
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Barrier transfer machine
A barrier transfer machine, also known as zipper machine or road zipper, is a type of heavy vehicle that is used to transfer concrete lane dividers, such as Jersey barriers, in order to relieve traffic congestion during rush hours. Many other cities use them temporarily during construction work. The lanes created by the machine are sometimes referred to as "zipper lanes".
One advantage of barrier systems over other lane management treatments such as traffic cones or overhead directional lights is that a solid, positive barrier prevents vehicle collisions due to motorists crossing over into opposing traffic flow. A disadvantage is that lane widths can be slightly reduced.
The Road Zipper variant has been in existence since 1984–1985. [citation needed] Auckland Harbour Bridge had its original moveable barrier system installed in 1990. The Hawaii Department of Transportation debuted a zipper Lane on Oahu on August 18, 1998. The Benjamin Franklin Bridge has had a permanent barrier transfer system since 2000, when it was installed by the Delaware River Port Authority. A movable barrier system was introduced in Sydney, NSW, Australia, in 2012. The Golden Gate Bridge had a permanent 13,340-foot (4,070 m) movable barrier system installed in January 2015.
The vehicle contains an S-shaped, inverted conveyor channel in its undercarriage which lifts the barrier segments (which may weigh over 1,000 pounds (450 kg)) off the road surface and transfers them over to the other side of the lane, reallocating traffic lanes to accommodate increased traffic for the currently dominant (peak) direction. These barriers are linked together with steel connectors to create a sturdy but flexible safety barrier.
The minimum length for some barrier systems is 100 feet (30 m). The length can vary based on application and the amount of barrier needed to effectively deflect an errant vehicle.
Some barrier systems have four rubber feet on the bottom of each segment “to increase the coefficient of friction between the barrier element and the road surface”. This helps the barrier resist vehicle impact and keeps the barrier from moving significantly if struck.
Barrier transfer machines can typically move their barrier segments anywhere between 4 and 24 feet (1.2 and 7.3 m) in one pass, usually at a speed between 5 and 10 miles per hour (8.0 and 16.1 km/h). Some models of the machine hold 50 feet (15 m) of barrier at a time as they are engaged in transferring. The machine can transfer within the regular traffic flow without hindering other vehicles:
Admirably engineered, the barrier-moving process does not compromise traffic flow in either direction, and the truck is shielded by the blocks it's moving. If you're traveling in the same direction as the truck, the lane it's working behind is already blocked. And if you pass the vehicle at the speed limit, you can safely move into the lane ahead of it. Oncoming motorists, meanwhile, are prevented from entering the zipper's lane by the concrete barriers in front of it, and they can move into a lane after they have passed the truck.