Convertible Roadways and Lanes (2004) / Chapter Skim
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Pages 23-34
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From page 23... ...
11 CHAPTER THREE PLANNING AND DESIGN The review of planning and design for reversible lane systems showed that the implementation of reversible segments has occurred through the use of a variety of techniques and levels of effort. The size and formality of the effort have largely been a function of the frequency, permanence, and characteristics of its use.
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12 carried out to test methods for determining the benefits of reversible operation rather than to justify their application from among a set of possible alternatives. One of the earliest planning studies was conducted by the WSDOT to evaluate the feasibility of reversible lanes on Interstate 5 in Seattle.
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13 • • • • cilities. Professional transportation organizations such as AASHTO and ITE have developed consistent guidelines for their use, as have many overseas highway agencies.
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14 Recommendations for the application of reversible lanes have also been documented in previous versions of the MUTCD. Although the Millennium Edition of the MUTCD provides guidance for the application of various forms of control for reversible lane facilities (discussed in chapter four)
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15 clude the elimination of the need for "paired streets," such as would be required for exclusive one-way streets; more efficient utilization of parallel arterial roadways; and elimination of the need for traffic to shift to another street. Among the disadvantages are reduced capacities for flow in the minor direction, operational difficulties at the termini, and need for concentrated law enforcement to prevent violations of lane-use restrictions.
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16 On-Street Parking Prohibition As with other use policies, the prohibition of on-street parking on reversible roadways in densely developed urban areas can have mixed impacts. The main reason to disallow parking is to make more of the road cross section usable for the movement of traffic.
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17 usually require the prohibition of on-street parking and left-turn movements, as discussed in detail later in this chapter. Conversely, however, it has also been suggested that uncongested traffic flow actually encourages more shoppers to use the businesses, because they are able to access them conveniently.
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18 FIGURE 6 Proposed future cross section for the Katy Freeway (Source: Texas DOT 2003)
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19 FIGURE 7 Reversible freeway segment with wide cross section, suburban Washington, D.C. and suburban Virginia.
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20 FIGURE 10 Reversible flow freeway interchange (Source: Drew 1967)
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21 FIGURE 12 Gated reversible lane entry point, suburban Washington, D.C. and suburban Virginia.
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22 FIGURE 15 I-37 evacuation contraflow entry point, Corpus Christi, Tex. (Courtesy: Garry Ford, Texas Transportation Institute, San Antonio)
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