The extensions occur along the curbstone and are placed at strategic locations to force traffic to slow down by weaving around them. The theory is the more narrow a street and tree-lined, the slower the traffic. Chokers narrow streets from point to point, allowing only one-way traffic to pass through. They have been used effectively in Arizona. Of all the options, street humps are the most popular, accounting for the majority of traffic control devices.
Speed humps differ from speed bumps, which are normally found in shopping centers.
Speed humps are a kinder, gentler approach to calming traffic on local streets. Portland, Ore., uses speed humps in about 45 percent of its traffic calming projects and the other devices about 55 percent of the time. Pilot traffic control projects could begin in mid-summer in Fort Worth if the program procedures are approved by council when presented by staff in two weeks. Fees are charged based on the number of people attending the function - a security deposit is normally required, too. Also available are accommodations for indoor events at the city's numerous community centers.