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the exit lane to remain unimpeded. Speed Humps Speed humps differ from speed bumps in that they are from three to four inches high at the highest point and are much longer than bumps. We currently use 12 foot long humps. They can be driven over at about 15 miles per hour without the jolt that bumps give. At higher speeds they are very uncomfortable and may cause the vehicle to bottom out. The design of Evanston's humps follows the recommended guidelines published by the Institute of Transportation Engineers. Speed Bumps Speed bumps are not recommended for use on any streets, but City Council has approved their use in alleys. Two thirds of the residents along the alley must support the bumps. These devices are considered in the category of neighborhood traffic control and are included in this program at no charge to the residents along the alley. Speed Monitoring Options Traditional Police Enforcement Police enforcement is an essential part of any traffic control plan and it is recommended that it be continued. It can be used to enforce new traffic control regulations and to monitor existing regulations. It must be recognized that it is impossible to have officers monitor each posted speed zone every day, so other techniques for speed monitoring are necessary and are discussed in the next section. Speed Monitor This is a trailer- mounted unit that has radar and a speed display. It shows the speed of the vehicle to the driver (SPEED LIMIT XX YOUR SPEED IS XX MPH) and has been shown to reduce speeds, even if no police are in view. These units be used on any type of street. Neighborhood Speed Watch This technique involves measuring the speed of traffic on neighborhood streets and recording the license plates of speeding vehicles. Plate numbers are turned over to the Police and the owners are written letters advising them to be more careful and respect traffic laws. The speed measuring is done by using radar units borrowed from the Traffic Bureau of the Police Department. It is relatively inexpensive, but does involve time to obtain registration information and produce the letters. Also, the residents involved in data collection must be trained to use the equipment so that accurate results are obtained. The Traffic Engineering Division also has a program similar to this, but it does not involve citizens. In this program, license plates of violators of various types of regulations are recorded (if time allows during 11