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Case Study B2- Right Turn from Minor Road

Case Study B2- Right Turn from Minor Road. By : Doi Pham Mai Vu Anthony Tran. Case B2 Right Turn from Minor Road . Case B2 Right Turn from Minor Road. Formula: a= 14.5(ft) + 0.5 L w b= 1.47 V major t g 14.5 is the distance from the decision point to the ETW L w is length wild

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Case Study B2- Right Turn from Minor Road

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  1. Case StudyB2- Right Turn from Minor Road By : Doi Pham Mai Vu Anthony Tran

  2. Case B2 Right Turn from Minor Road

  3. Case B2 Right Turn from Minor Road • Formula: • a= 14.5(ft) + 0.5 Lw • b= 1.47 Vmajortg • 14.5 is the distance from the decision point to the ETW • Lw is length wild • Vmajor is design speed on major road • tgis time gap for minor road vehicle to enter major road (second)

  4. Case B2Right Turn from Minor Road

  5. Case B2Right Turn from Minor Road • The time gap in case B-1 can be decrease by 1.0 s for the right turn maneuvers without undue interference with major-road traffic. The design values based on these adjusted time gaps are shown in Figure 3 for passenger cars. Figure 4 includes the design values for the design vehicle for each of the time gaps in Figure 2.

  6. Case B2Right Turn from Minor Road

  7. Case B2Right Turn from Minor Road

  8. Case B2Right Turn from Minor Road • Example: • Given: Passenger Car, Single Unit Truck, Combination Truck. • Vmajor = 60mph • 2 lane road-way • 5% upgrade • Find: For case B2 find tg, a, b • Solution: • Governing Equation: • a= 14.5(ft) + 0.5 Lw(total) • b= 1.47 Vmajortg • tg(PC total) = tg(PC) + 0.1*5 • tg(SUT total) = tg(SUT) + 0.1*5 • tg(CT total) = tg(CT) + 0.1*5 • The Result can be calculated by using Excel. We can check the result of b base on Figure 3, 4.

  9. Case B2Right Turn from Minor Road

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