All posts by presencebuilders

New RRFB WW+S Flash Pattern (IMSA Jan/Feb ’15)

By Susan Marshall Electrotechnics Corporation (ELTEC)

On July 25, 2014 the FHWA approved a “new and improved” flash pattern for RRFB (Rectangular Rapid Flashing Beacons) uncon-trolled pedestrian crossings.

Image_002The new flash pattern is based on a flash cycle length of 800 milliseconds (ms) equaling 75 flash cycles per minute. It’s referenced as “WW+S” (Wig-Wag plus Simultaneous). The sequence is:

  • Left beacon ON 50 ms Both beacons OFF 50 ms
  • Right beacon ON 50 ms Both beacons OFF 50 ms
  • Left beacon ON 50 ms Both beacons OFF 50 ms
  • Right beacon ON 50 ms Both beacons OFF 50 ms
  • Both beacons ON 50 ms Both beacons OFF 50 ms
  • Both beacons ON 50 ms Both beacons OFF 250 ms

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Antennas Mounted on Water Towers Support School’s IP Time Clocks

The school zone flashing beacons in Longview, Texas (pop 85,000) used a paging system to program school signals. Keith Covington, Traffic Signal Supervisor, determined the system “limited us, not only communicating with the clocks but monitoring the clocks”. ELTEC’s SYSTEM 3000 was chosen to centrally program, manage, and monitor each TC-3000 IP time clock (36 total).

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Walkable, Bike-able Summit

Toby Whitmore, Technical Sales Representative for Signal Service

Toby Whitmore, Technical Sales Representative for Signal Service

On May 7th, Signal Service based in West Chester, PA participated in Delaware’s “Walkable, Bike-able Summit”.  Pedestrian safety (walking and/or bicycling) was a primary focus.  Signal Service displayed the extremely effective Rectangular Rapid Flashing Beacon (RRFB) pedestrian crossing for uncontrolled crosswalks.

According to Toby Whitmore, Technical Sales Representative for Signal Service, “it was a big hit.  We got lots of questions from the DOT and bike advocacy groups.”

Solutions for Spot Devices’ School Beacons (IMSA Jan/Feb ’15)

When the SIMA software service was discontinued, remote communication and programming to Spot Devices’ school zones systems was no longer possible; nor was there a means for programming at the pole. For the MODOT (Missouri) Southwest District, ELTEC designed a cost-effective solution while salvaging as many parts as possible. Specifically, the cabinet, battery, charge controller, solar panel, and beacon were reused.

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Always Green Traffic Control – Congestion Solution (Aerial View)

Congestion wastes gas

The U.S. Treasury Department estimates that traffic congestion wastes 1.9 billion gallons of gas and costs American drivers $100 billion a year in lost fuel and time. With more than 311,000 traffic lights in the country, every second sitting at red lights adds up.

This is an aerial view of Always Green Traffic Control at an intersection northward and eastward traffic flows are 2650 vehicles per hour. Southward and Westward are 850 vph. This is peak flow & very heavy traffic.

Congestion Solution – Always Green Traffic Control

This has never been done before, 7,100 vehicles per hour (vph) and no queueing. Always Green Traffic Control (AGTC) is carrying 2650 vph loads North and East, 850 vph loads South and West with absolutely no queueing. Without AGTC the same loads cause massive backups.

Marshall, TX would benefit from my technology. Annoying stops on highways like 59 and 80 could be eliminated along with the long stops for cross traffic. This technology can give freeway-like travel to outdated highways like 59 and 80 and make them and the towns along them relevant again by making travel on them pleasant and efficient.