Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 8, Problem 23P
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Chapter 8 Solutions
Traffic and Highway Engineering
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- An existing six-lane divided multilane highway with a field-measure free-flow speed of 45mph serves a peak-hour volume of 4,000 vehicles per hour, with 10% trucks (50% SUT, 50% TT). The PHF is 0.88. The highway has generally rolling terrain. What is the likely level of service for this segment? Good weather, no incidents, no work zones, and regular drivers may be assumed.arrow_forwardAn existing four-lane freeway in rural area is with the following :information Lane width 3.5m, 0.9m lateral clearance, 1800 veh/hr peak hour volume, PHF=0.9, interchange density =0.90, 5% trucks, 5% buses and the road is within a mountainous terrain. Then based on the HCM procedure, the service flow rate (pc/h/In) isarrow_forwardThe minimum cycle length for an intersection is determined to be 95 seconds. The critical lane group flow ratios were calculated as 0.235, 0.250, 0.170, and 0.125 for phases 1–4, respectively. What Xc was used in the determination of this cycle length, assuming a lost time of 5 seconds per phase?arrow_forward
- A new section of a freeway is to be designed with a free-flow-speed of 65 mph along of 0.75 mile on 5% upgrade. The expected traffic volume is 4200 v/hr. The traffic composition is 15% trucks, 5% recreational vehicles, and 10% buses. The peak hourly factor is 0.9, the unfamiliar driver factor is 0.95. If the design requirement is to target a level of service (B), how many lanes must be provided to satisfy the design requirement?arrow_forwardDraw a space – time diagram for traffic within a tunnel. Assuming there exist a 2-lane before the tunnel but the tunnel itself is 1-lane and after the tunnel the road returns to being a 2-lane.arrow_forwardQ3b. The 15km Atta Mills road connecting Old Barrier to Kokrobite operates with a capacity of 2250 pcu/hr and can be traversed within 15 minutes under free flow conditions. If a flow of 3100 pcu/hr is assigned to the road based on the capacity-restrained approach, what would be the resultant travel time after the traffic assignment proce ss.arrow_forward
- Determine the approximate center to center spacing of vehicles in a certain lane if the average speed of the cars using that particular lane is 40 kph and the volume of traffic is 800 vpharrow_forwardIf 420’ are available as Sight distance on an urban highway having a 2.5% grade. Assuming all the parameters according to ASHTO, find maximum speed which can be posted on the highway for safe travelling.arrow_forwardA 6-lane urban freeway is suggested to be designed with the following data: F.ADT = 45000 vpd, design hour factor= 0.12 and directional split = 65%. Rolling terrain, 10% trucks, 5% buses, 6% Rvs, PHF is 0.91 and all traffic are commuters. Then based on the HCM 2000 procedure, the equivalent passenger- car hourly flow rate is aboutarrow_forward
- A section in SCTEX has a flow density relationship of q = 75k - 2.7k² where q is the flow and k is the density. what is the space mean speed if the density of the expressway is 15 veh/kmarrow_forwardDetermine the practical stopping distance (m) for a road with speed limit of 50kph and grade of 4.9%.arrow_forwardOne segment of a Class I two-lane highway is on level terrain and has an hourly volume of 1200 veh/h (total for both directions), a directional traffic split of 50/50, and PHF = 0.92, and the traffic stream contains 5% large trucks, and 2% buses. It has 11-ft lanes, 2-ft shoulders, access frequency of 10 per mile, 50% no-passing zones, and a base FFS of 55 mi/h, determine the level of service for this two-lane highway segment.arrow_forward
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