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However, grade-separated pedestrian crossings with steps introduce accessibility problems. Some crossings have lifts, but these can be time-consuming to use. Grade-separated roads that permit for higher speed limits can actually reduce safety due to 'weaving' (see below) as well as a perceived sense of safety.
The Mattapan Line (alternatively the Mattapan Trolley and historically the Ashmont–Mattapan High-Speed Line) is a partially grade-separated light rail line which forms part of the MBTA's Red Line rapid transit line.
The construction of the Nenagh to Limerick section was slow and difficult. Work on this section began on 7 December 2006 and was initially due to be completed in May 2009. [4] The total length of the scheme is 38 km (24 mi), of which 10 km (6.2 mi) was the upgrading of the single carriageway Nenagh bypass. The road opened in three stages.
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The Texas Transportation Institute estimated that, in 2000, the 75 largest metropolitan areas experienced 3.6 billion vehicle-hours of delay, resulting in 5.7 billion U.S. gallons (21.6 billion liters) in wasted fuel and $67.5 billion in lost productivity, or about 0.7% of the nation's GDP. It also estimated that the annual cost of congestion ...