Among public works problems that get citizens' attention, traffic problems rank high on the list. Nothing gets a public works official's phone ringing with angry calls quite like recurring bumper-to-bumper congestion on a municipality's roadways, and with towns all across the country experiencing record growth, traffic is becoming a quandary that needs to be dealt with efficiently, creatively, and immediately.
Intelligent transportation systems (ITS) offer a range of ways for agencies, large and small, to combat headaches. However, with advances in traffic signal control coming at a rapid pace, keeping up with all the changes, designing a system that fits your needs, and implementing and managing an ITS can be challenging.
The ITS Decision Web site—www.calccit.org/itsdecision—profiles a project launched by the California Center for Innovative Transportation, which is a unit of the University of California Berkeley Institute of Transportation Studies, and the California Department of Transportation. Designed primarily as a resource for local and regional transportation decision-makers, the site offers comprehensive information about ITS services and technologies, assembling data and research from wide-ranging sources, digesting it, and presenting it in an objective, helpful manner.
According to the site, there are several reasons why implementing an ITS and using advanced signal control would be beneficial to your agency. In a network of streets with poorly timed signals, for example, the fuel consumed by vehicles stopping and idling accounts for approximately 40% of network-wide fuel consumption. In addition, because urban growth has left many municipalities with no room left to expand their streets and roads, optimizing traffic signal control is critical to keeping an agency's road system from working at maximum capacity, and not straining beyond it.
Actuated signal controllers
The ASC/3 series of advanced system controllers complies with all National Electrical Manufacturers Association TS2 and National Transportation Communications for ITS Protocol requirements. Its hardware design allows it to serve as a platform for traffic management systems or for future upgraded environments. Compatible with all of the company's existing systems, it uses a reliable, easy-to-maintain controller. Users can perform quick updates in the field without having to change hardware. Other features include 120 coordination patterns, 64 vehicle detectors, 200 programmable schedule programs, and a range of control capabilities. Econolite Control Products Inc. www.econolite.com.
Rugged data counter
The Delta III portable road-tube classifier can withstand harsh operating conditions while collecting data or performing volume studies on multi-lane, high-traffic roadways. Single-button operation enables the user to select data type and layout; then, simply press the start button three times to begin collecting data. With the company's TMWin or vehicle identification and analysis system software, the user can collect and analyze data for a wide range of reports. It features standard 2 MB memory (upgradable to 4 MB), long battery life, and durable but lightweight construction. TimeMark Inc. www.timemarkinc.com.
Bike path signal
The Cross Alert System, when positioned at a site where a bike path intersects with a roadway, detects motion on the path and warns motorists by flashing an amber warning light. Radio-controlled early-warning poles that flash when path activity is detected can be placed as far as 400 feet from intersections where a higher speed limit or restricted sight distance factor in. The product is best for two-lane roads with average daily traffic of less than 15,000 vehicles. It can work off of a battery alone for more than a week. The signage can be customized to fit the needs of a particular application. Cross Alert Systems. www.crossalert.com.
Portable traffic counter
The Hi-Star portable traffic counter/ classifier is a small unit that, when placed in the center of a traffic lane, provides data on volume, speed, and length of vehicles; temperature; and wet/dry conditions. The product can be used for volume and time studies on public roadways, monitoring speeds on parking lots and in garages, and other public or private applications. Its Windows-based software programs and retrieves data from the unit, then correlates traffic study data and presents it in an easily interpreted report. Nu-Metrics, a Quixote Transportation Technologies Co. www.nu-metrics.com.
Plastic safety barricade
Designed for use as a short-term traffic redirection device, the Road-Runner RUT model 66 plastic safety barricade offers the strong visibility of a solid barrier, but is highly portable. Because it can be stacked, it saves transportation, storage, and handling costs. A 1-ton truck can carry 330 feet of barricade to a zone in a single trip, and one operator can set up and take it down. The barrier is inherently stable, but water or sand can be added to each base for additional ballast. Premier Plastics Inc. www.traffic-barrier.com.
The company offers an array of signs and stands for use around construction work zones. The line includes a number of sign stands designed for quick access and compact storage. In addition, the company has added several models to its line of reflective and mesh signs. Work Area Protection Corp. www.workarea protection.com.
The Interstate Grade FG 300 curb system—suitable for use on toll roads, freeway intersection acceleration lanes, and other challenging applications—combines a curb and base unit to create a tough curb section. Designed to work with the company's FG 300 EFX polyurethane post, it offers thick ribs, one-piece construction, and the ability to withstand loads to 10,000 pounds. It can be installed by one person in minutes. The brightly colored product offers a strong visual target. An optional vertical panel measuring either 4x22 inches or 3x39 inches is available. Filtrona Extrusion. www.davidsontraffic.com.
Portable speed bump
The Traffic Guard portable speed bump offers users a temporary solution for traffic conditions, including temporary traffic patterns around work zones, and emergency situations. It eliminates many of the liability and maintenance concerns associated with permanent speed bumps. The soft carry bag and mobile hand-truck models offer long-lasting construction and readily replaceable parts. The most commonly used model is compact—approximately the size of a spare tire—and can easily be stacked and stored in a truck. Astro Optics Corp. www.astroopics.com.
BlinkerSigns are high-visibility, solar-powered traffic signs, featuring super-bright flashing light-emitting diodes. They alert drivers farther in advance to work zones—up to 2 miles away—to prevent accidents. Because they are powered by a battery and solar panel, they can be installed anywhere, with no concerns of power outage and no hardwiring required. Users can activate the signals via pushbutton, handheld computers, or the company's wireless controller. Because the signs can be installed on any kind of post, they are suitable for temporary or permanent installation. TAPCO Inc. www.tapconet.com.
Portable plastic barrier
The Roadguard/2 is a portable Jersey-style barrier made of blow-molded, high-density polyethylene plastic, making it durable and easy to handle. The double-chambered barrier measures 6 feet long, 42 inches high, 2 feet wide at the bottom, and 10 inches wide at the top. When filled with water, the barrier weighs 1600 pounds. Features include a self-locking ramp, pin, and hole system; two handgrips at each end; and built-in slots and channels for signs, fencing, and flashers. Traffic Safety Devices Inc. www.roadguardbarrier.com.
Radar speed display
The RU2 Fast 750 radar speed display trailer has a 12-inch light-emitting diode that is 7 feet tall when raised into operating position. It is raised and lowered with an electric actuator, making setup easy. The trailer is simple to tow and place into position, making it ideal for work zones, neighborhood streets, and other areas in which speeding is a recurring problem. The sign runs five to eight days before requiring a recharge. Options include a data acquisition package, solar panel, alarm system, and trailer cover. RU2 Systems Inc. www.ru2systems.com.