Click for next page ( 27


The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement



Below are the first 10 and last 10 pages of uncorrected machine-read text (when available) of this chapter, followed by the top 30 algorithmically extracted key phrases from the chapter as a whole.
Intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text on the opening pages of each chapter. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.

Do not use for reproduction, copying, pasting, or reading; exclusively for search engines.

OCR for page 26
26 be an issue. If a new sign will be introduced, for example, number of vehicle collisions. In its first year of operation, educate the public on what it means and why it is impor- METRORail recorded 62 accidents, 55 accidents in 2005, and tant to respect it. RTD did a public awareness campaign 36 in 2006. As of May 31, 2007, there had been only 14 acci- regarding the contra-flow section of the LRT. Using tele- dents in 2007 (17). The decline in accidents is the result of the vision spots, the campaign re-educated motorists to look continued implementation of the recommendations set forth both ways at intersections. by TTI. More recent changes to the system are discussed in the Take away movements with gates. In RTD's new LRT following sections. section, they plan to remove certain movements with the use of gates. Active Turn Prohibition Symbol Signs with TRACK Symbol METROPOLITAN TRANSIT AUTHORITY OF HARRIS COUNTY (METRO)--HOUSTON, TEXAS Originally at intersections where left turns were protected/ permitted, METRO used active light-emitting diode (LED) In January 2004, METRO began operation of 7.5 miles of signs that displayed the words "No Turns." Now they use LRT, known as the Red Line, all of which are street-running. active turn-prohibition symbol signs with the "Track" symbol. The rail line travels at grade along the surrounding streets. Most of the alignment is side-running or median-running. There is a portion of mixed-use alignment in the Texas Med- In-Roadway Lights ical Center (TMC). In the TMC, motorists making left turns onto side streets and into garages and hospitals must share Currently, they are experiencing problems with motorists space with LRVs on the trackway to make their turns. Special running red lights with a resulting shift in collision types. signals and signage are used to indicate to drivers when they METRORail now experiences as many or more right-angle are allowed to be on the trackway to make turns. Left turns are collisions resulting from motorists running red lights on the not allowed on some parts of the alignment and are allowed cross street than those involving motorists making left-turns. only at signalized intersections on other parts of the alignment. In 2006, METRO began testing in-roadway flashing lights to get motorists' attention to stop at the red lights at signalized intersections with LRT. The lights are red, installed along the Problems stop bar, and flicker left to right at a rapid pace. Initially, the most common type of collisions that occurred Between May and October of 2007, METRO installed the between motor vehicles and METRORail vehicles involved in-roadway lights at 11 intersections along the Main Street cor- illegal left turns by motorists. In the median-running sections ridor. Prior to installation of the in-roadway lights, there were of the alignment, motorists would make illegal left turns at about eight red-light running accidents each year at these intersections where left turns were prohibited. In TMC's 11 intersections for the previous 3-year period (2004 to 2006). mixed-use environment, drivers had difficulties understand- Since installation of the in-roadway lights at the intersections ing the layout and the traffic control, specifically where they on average for about 11 months, they have experienced only had to make left turns from a left-turn pocket on the tracks. two red-light running accidents at the intersections. More recently, METRO has seen a shift from left-turn col- METRO tested the in-roadway lights at two TMC inter- lisions to right-angle collisions resulting from motorists run- sections where left-turn vehicles must enter the trackway to ning red lights on the cross-street approaches to signalized turn left. The in-roadway lights were placed along the stop intersections with LRT. bar in the left-turn lane; however, they have not had the same success with the in-roadway lights in this application as they Mitigation Strategies have had on the cross-street approaches. An FHWA study is expected to be completed in 2008 on the in-roadway lights. In February 2004, after just 1 month of operation, METRO requested the assistance of TTI for an analysis of the rail line's In addition to the modified signage in the TMC, they are safety. A research team consisting of experts from TTI and currently considering the use of retractable delineators to indi- the light rail industry reviewed the collisions and observed cate to motorists when they are allowed to get onto the tracks conditions along the rail right-of-way. After the assessment, to make a left turn. In this application, the delineators would METRO implemented a variety of countermeasures to miti- pop up along the lane line that separates LRVs and the traffic. gate collisions, including improving signage for motorists. As They are currently under trial at a maintenance facility. a result, they have seen a reduction in collisions of approxi- mately 40% since the first year of operation (16). In March 2004, all-red signal phasing was implemented at 12 signalized intersections along the alignment, and METRO On May 31, 2007, METRO released METRORail accident reports that they have been effective in controlling the number statistics, which showed a continuing downward trend in the of collisions.