Determine the saturation flow rate (in veh/h) for a left-turn lane that operates in a permitted-only mode, under the followingconditions.Opposing demand flow rate = 1,100 veh/hLane width 11.5 ftHeavy vehicles = 4% of the traffic streamApproach grade -6%No on-street parkingNo bus stopsBicycle and pedestrian traffic conflicting with this lane group is negligible:Intersection is not in a central business districtveh/h

Step 1: Define formula The required formula for saturation flow rate is given by ; Saturation flow…

Answered: Determine the saturation flow rate (in…

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter10: Capacity And Level Of Service At Signalized Intersections

Section: Chapter Questions

Problem 8P

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3. Determine the LOS for pedestrians at two-phase signalised intersection with a cycle length of 90 s. the phase serving the major street vehicular traffic gets 50s of green whereas the phase serving the minor street vehicular traffic gets 30 s of green. Useful formula: dp Table for assessing the LOS LOS A B C D E F 0.5(C-g)² C Average delay/pedestrian (s) >5 ≥ 5-10 > 10-20 >20-30 ≥ 30-45 > 45
The average normal flow of traffic on cross roads A and B during design period are 400 and 250 pcu per hour; the saturations flow values on these roads are estimated as 1250 and 1000 pcu per hour respectively. The all-red time required for pedestrian crossing is 12 secs. Design two phase traffic signal by Webster's method.
select all correct options.
Analyze the unsignalized intersection below and calculate the optimum cycle length if the intersection will be signalized. Approach E W N S Maximum no. of lanes 5 5 4 4 Direction Through left Through left Through left Through left N Total volume pcu/hr 1,480 370 860 586 1,360 494 2,030 265 Sat. flow rate pcu/hr/lane 2,400 1,700 2,400 1,700 2,200 1,800 2,200 1,800
A six-lane freeway (three lanes in each direction) in mountainous terrain has 10-ft lanes and obstructions 1 ft from the right edge. There are five ramps within three miles upstream of the segment midpoint and four ramps within three miles downstream of the segment midpoint. The traffic stream consists of mostly commuters with a peak hour factor of 0.84, peak-hour volume of 2500 vehicles, and 4% recreational vehicles. What is the level of service? (Write the letter only)
The maximum flow that could pass through an intersection from a given approach, if that approach was allocated all of the cycle time as effective green with no lost time. Saturation flow B) cycle flow Peak flow (D Approach capacity
Consider the geometric and traffic characteristics shown below. Approach (Width) Peak hour Approach Volumes: North (56 ft) South East West (56 ft) (68 ft) (68 ft) Left Turn Through Movement Right Turn Conflicting Pedestrian Volumes PHF For the following saturation flows: 165 105 200 166 442 395 585 538 172 167 201 210 900 1,200 1,200 900 0.95 0.95 0.95 0.95 Through lanes: 1,600 veh/h/In Through-right lanes: 1,400 veh/h/In Left lanes: 1,000 veh/h/In Left-through lanes: 1,200 veh/h/In Left-through-right lanes: 1,100 veh/h/In The total cycle length was 289 s. Now assume the saturation flow rates are 10% higher, that is, assume the following saturation flow rates: Through lanes: 1,760 veh/h/In Through-right lanes: Left lanes: Left-through lanes: Left-through-right lanes: 1,540 veh/h/In 1,100 veh/h/In 1,320 veh/h/In 1,210 veh/h/In Determine a suitable signal phasing system and phase lengths (in s) for the intersection using the Webster method. (Enter the sum of green and yellow times for…
Four-phases signal with a cycle time of 80 sec, Inter Green = 4 sec/phase, lost time / phase = 2 sec. Saturation flow on all approaches are similar, but the maximum traffic flows on two of the phases are triple the maximum traffic flows on the remaining two approaches, what will be actual green time on each phase ?
A Four Lane freeway is located on rolling terrain with a free flow speed of 70 mph,12ft lanes, and no lateral obstructions within 8 ft of the pavement edges. the traffic stream consists of cars, buses and large trucks (no recreational vehicles) . A weekend directional peak hour volume of 1800 vehicles (*regular users*)is observed ,with 700 arriving in the mostly congested 15 minutes period . if a level of service no worse than C is required ,determine the maximum number of large trucks and buses that can be present in the peak hour traffic stream.. Dislike for wrong answers
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?
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