One segment of a Class I two-lane highway is on rolling terrain and has an hourly volume of 950 veh/h (total for both directions), a directional traffic split of 70/30, and PHF = 0.85, and the traffic stream contains 6% large trucks, 3% buses, and 6% recreational vehicles. The two-lane highway segment has the following additional characteristics: 10-ft lanes, 2-ft shoulders, access frequency of 12 per mile, 60% no-passing zones, and a base FFS of 55 mi/h. For these conditions, determine: (1) The analysis direction [1] and opposing direction [2] flow rates for ATS and PTSF.

One segment of a Class I two-lane highway is on rolling terrain and has an hourly volume of 950 veh/h (total for both directions), a directional traffic split of 70/30, and PHF = 0.85, and the traffic stream contains 6% large trucks, 3% buses, and 6% recreational vehicles. The two-lane highway segment has the following additional characteristics: 10-ft lanes, 2-ft shoulders, access frequency of 12 per mile, 60% no-passing zones, and a base FFS of 55 mi/h. For these conditions, determine: (1) The analysis direction [1] and opposing direction [2] flow rates for ATS and PTSF.

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter9: Capacity And Level Of Service For Highway Segments

Section: Chapter Questions

Problem 21P

See similar textbooks

Similar questions

One 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.
A freeway is being designed to carry a heavy volume of 5000 veh/h on a regular weekday in rolling terrain. If the PHF is 0.9 and the traffic consists of 90% passenger cars and 10% trucks, determine the number of 12-ft lanes required in each direction if the highway is to operate at level of service C. The free-flow speed is 70 mi/h, there is no lateral obstruction, and interchanges are 3 mi apart.
A six-lane divided highway (three lanes in each direction) is on level terrain with 6 access points per kilometer and has 3.6-m lanes, with a 1.2-m shoulder on the right side and a 0.6-m shoulder on the left side. The peak-hour factor is 0.80, and the directional peak-hour volume is 3,500 vehicles per hour. There are 5% large trucks and 3% recreational vehicles. A significant percentage of non-familiar roadway users are in the traffic stream (the driver population adjustment factor is estimated as 0.85). No speed studies are available, but the posted speed limit is 80.5 km/h. Determine the level of service.
A four-lane undivided multilane highway (two lanes in each direction) has 11-ft lanes, 4-ft shoulders, and 10 access points per mile. It is determined that the roadway currently operates at capacity with PHF= 0.80 and a driver population adjustment of 0.9. If the highway is on level terrain with 8% large trucks and buses (no recreational vehicles) and the speed limit is 55 mi/h, what is the directional hourly volume?
A four-lane rural freeway segment has a 510 m grade length of 2% upgrade followed by a 630 m grade length of 3%. The freeway has 3.4-m lane, 1.5m left-shoulder lateral clearances and interchanges spaced at every 25 km. During the peak hour, there are 6% trucks, 2% buses, 2% recreational vehicles and the rest are passenger cars. Driver population adjustment is determined to be 0.90, peak hour factor is 0.90 and the BFFS is 110 km/h. At present, the freeway operates at capacity during the peak hour in the direction in question. If an additional 3.4 m lane is introduced, and all other factors stay the same, what will be the new level of service?
A four-lane urban freeway segment has a peak demand volume of 3,500 vehicles per hour for the two eastbound lanes. The PHF is 0.95 and there are no trucks, buses or RVs because the freeway is classified as a parkway and such vehicles are prohibited. The segment has 12 ft lanes, no lateral obstructions, 3 ramps within the influence area, and meanders through some beautiful rolling terrain. Assuming the road will be used by commuters and those familiar with the road, what is the flow rate (pcphpl)? Provide your answer to the nearest integer.
A six-lane urban freeway (three lanes in each direction) is on rolling terrain with 11-ft lanes, obstructions 2 ft from the right edge of the traveled pavement, and nine ramps within three miles upstream and three miles downstream of the midpoint of the analysis segment. The traffic stream consists primarily of commuters. A directional weekday peak-hour volume of 2300 vehicles is observed, with 700 vehicles arriving in the most congested 15-min period. If the traffic stream has 15% large trucks and buses and no recreational vehicles and at some point, further along the roadway there is a 6% upgrade that is 1.5 mi long. (assuming that the proportion of vehicle types and the peak-hour factor remain constant) Determine the FFS value in mi/hDetermine the PHF or Peak Hour FactorDetermine the fHVDetermine the value of vp
A segment of a Class I two-lane highway is on rolling terrain and has an hourly volume of 600 veh/hr in the analysis direction and 600 veh/hr as well in the opposing direction. The highest 15-minute volume in both directions is 156.25 veh/15 min. Passing is permitted throughout the highway. The main traffic consists of 96% passenger cars with 3% Large Trucks and buses and 1% RV's. The width per lane is 2.7m with a shoulder-width of 0.9m. 7 access points per kilometer is detected. The base free-flow speed is 102 kph. answer all and get a like 1. Calculate the free-flow speed in m/s 2. Calculate the flow rate in the opposing direction (veh/hr) for ATS after considering grade adjustment and heavy vehicle factor 3. Calculate the flow rate in the opposing direction (veh/hr) for PTSF after considering grade adjustment and heavy vehicle factor 4. Calculate the service measure ATSFd 5. Calculate the service measure PTSFd 6. If it is desired for this segment of highway to have at least a Level…
A four-lane divided multilane highway (two lanes in each direction)in rolling terrain has the following additional characteristics:• BFFS of 60 mi/h (100 km/h)• No access points• 12-ft lanes (3.6m)• 8-ft (2.4m) shoulder on the right side and 6-ft (1.8m) shoulder on the left• The peak-hour factor is 0.84• The traffic stream consists of 6% trucks, 4% buses and 3% recreational vehicles.• The driver population adjustment factor is estimated at 0.90.• Analysis flow rate is 1250 pc/h/ln. i) A new urban development will be built in the proximity of this highway section. This development will require the addition of 20 access points per mile (12 access points per km) but all other conditions (geometry and traffic) will stay the same. What is the differential (change) in the average speed (S) before and after the urban development?
A six-Lane urban freeway (three lanes in each direction) is on rolling terrain with 11 feet lanes, obstructions to 2 feet from the right edge of the travel pavement, and eight ramps within three miles upstream and three miles downstream of the mid point of the analysis segment. The traffic stream consist primarily of commuters. A directional weekly peak our volume of 2300 vehicles is observed, with 700 vehicles arriving in the most congested 15-min period. If the traffic stream has 15% large trucks and buses and no recreational vehicles, determine the level of service
A six-lane freeway (three lanes in each direction) in rolling terrain has 10-ft lanes and obstructions (fLW = 6.0 mph) 4 ft from the right edge of the traveled pavement (fLC = 0.8 mph). There are five ramps within three miles upstream of the segment midpoint and four ramps within three miles downstream of the segment midpoint. A directional peak-hour volume of 2000 vehicles (primarily commuters) is observed, with 600 vehicles arriving in the highest 15-min flow rate period. The traffic stream contains 12% large trucks (ET = 2.5) and buses and 6% recreational vehicles (ER = 2.0). What is the estimated free-flow speed of the traffic stream in mph (whole number, nearest 5)? Blank 1 What is the peak-hour factor (3 decimal places)? Blank 2 What is the heavy-vehicle adjustment factor (2 decimal places)? Blank 3 What is the service flow rate (whole number, nearest 5)? Blank 4 What is the service measure value if the average speed of the traffic stream is 65 mph (one decimal place)? Blank 5
A six-lane freeway (three lanes in each direction) in rolling terrain has 10-ft lanes and obstructions (fLW = 6.0 mph) 4 ft from the right edge of the traveled pavement (fLC = 0.8 mph). There are five ramps within three miles upstream of the segment midpoint and four ramps within three miles downstream of the segment midpoint. A directional peak-hour volume of 2000 vehicles (primarily commuters) is observed, with 600 vehicles arriving in the highest 15-min flow rate period. The traffic stream contains 12% large trucks (ET = 2.5) and buses and 6% recreational vehicles (ER = 2.0). What is the estimated free-flow speed of the traffic stream in mph (whole number, nearest 5)? What is the peak-hour factor (3 decimal places)? What is the heavy-vehicle adjustment factor (2 decimal places)? What is the service flow rate (whole number, nearest 5)? What is the service measure value if the average speed of the traffic stream is 65 mph (one decimal place)?