Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 9, Problem 16P
To determine
The value of
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
An existing urban freeway with 4 lanes in each direction has the following characteristics.
Traffic data:
Peak hour volume (in the peak direction):
Trucks:
PHF = 0.93
Geometric data:
LOS A
LOS B
LOS C
LOS D
LOS E
LOS F
Lane width:
Shoulder width:
Total ramp density:
Terrain: rolling
11 ft
6 ft
1.8 ramps per mile
Determine the LOS in the peak hour. (Assume commuter traffic and assume no RVs.)
mean speed
density
7,010 veh/h
10% of peak hour volume
Show the demand flow rate (in pc/h/In), mean speed (in mi/h), and density (in pc/mi/In) for the given conditions.
demand flow rate
2199
pc/h/In
54 X mi/h
41 X
pc/mi/In
Determine the PTSF in each direction for a 4.5 mi (7.2 km) two-lane highway segmentin level terrain. Traffic volumes (two-way) are 1100 veh/h. Trucks: 10%; RVs: 7%; PHF:0.97; directional split: 60/40; no passing zones: 40%.
Problem
Determine the level of service? for six lanes undivided level highway. The
width of lane, shoulder on the right side, and shoulder on the left side are 10 ft,
2 ft, and 2 ft respectively. The directional hour volume is 3500 Veh/h. The traffic
composition includes 15% trucks and 1% RVs. The peak hour factor is 0.80.
Unfamiliar drivers use the road that has 10 access points per mile. The design
speed is 55 mi/h.
Discuss possible modifications to upgrade the level of service? (Verify your
answer)
Chapter 9 Solutions
Traffic and Highway Engineering
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- An existing urban freeway with 4 lanes in each direction has the following characteristics. Traffic data: Peak hour volume (in the peak direction): Trucks: PHF = 0.93 Geometric data: LOS A OLOS B LOS C LOS D LOS E LOS F Lane width: Shoulder width: Total ramp density: Terrain: rolling 11 ft 6 ft 1.8 ramps per mile Determine the LOS in the peak hour. (Assume commuter traffic and assume no RVs.) 7,090 veh/h 10% of peak hour volume Show the demand flow rate (in pc/h/In), mean speed (in mi/h), and density (in pc/mi/In) for the given conditions. demand flow rate 2191 pc/h/In mean speed density 50 X mi/h 43.82 X pc/mi/Inarrow_forwarddetermine PTSF and ATS in the peak direction if northbound volume is 1000 veh/h and southbound volume is 600 veh/h. 4.5 mi two-lane highway segment in level terrain Traffic volumes (two-way) are 1100 veh/h. Trucks: 10%, RVs: 7%, PHF: 0.97, directional split: 60/40, and no-passing zones: 40%. Base free flow speed: 55 mi/h, lane width: 11 ft, shoulder width: 3 ft, and access points/mi: 15.arrow_forwardAn existing urban freeway with 4 lanes in each direction has the following characteristics. Traffic data: Peak hour volume (in the peak direction): 7,110 veh/h Trucks: 10% of peak hour volume PHF = 0.93 Geometric data: Lane width: 11 ft Shoulder width: 6 ft Total ramp density: 1.8 ramps per mile Terrain: rolling Determine the LOS in the peak hour. (Assume commuter traffic and assume no RVs.) LOS A LOS B LOS C LOS D LOS E LOS F Show the demand flow rate (in pc/h/ln), mean speed (in mi/h), and density (in pc/mi/ln) for the given conditions. demand flow rate pc/h/lnmean speed mi/h density pc/mi/lnarrow_forward
- (TRAFFIC AND HIGHWAY ENGINEERING) An undivided multilane highway segment has two 11-ft lanes in the eastbound direction with no shoulders and a 55 mi/h speed limit. This highway segment has 40 access points on a 1.25-mile, 2.5% upgrade. During the highest 15 minutes of traffic flow within the peak hour, there are 755 vehicles and 12% of these are heavy vehicles with a 70%/30% mix of single-unit and tractor-trailer trucks. What are the estimated speed, density, and LOS of upgrade?arrow_forwardAn urban freeway is to be designed using the following information. AADT = 52,500 veh/day K (proportion of AADT occurring during the peak hour): D (proportion of peak hour traffic traveling in the peak direction): Trucks: PHF = 0.94 Lane width: Shoulder width: Total ramp density: Terrain: 3 Determine the number of lanes in the peak direction required to provide LOS C. (Assume commuter traffic and assume no RVs.) lanes. 0.12 0.65 8% of peak hour volume demand flow rate 12 ft 10 ft 0.5 interchange/mile; all interchanges are to be cloverleaf interchanges rolling HV' Show all calculations required. (Calculate your answers for the peak direction only. Enter fy, the peak hour volume in veh/h, the free flow speed in mi/h, the demand flow rate in pc/h/In, the mean speed in mi/h, and the density in pc/mi/ln.) fHV peak hour volume 0.893 free flow speed mean speed density 6300 X Your response differs from the correct answer by more than 10%. Double check your calculations. veh/h 1500 X Your…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_forward
- 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_forwardThe heavy vehicle adjustment factor for a freeway in rolling terrain with 5% heavy trucks is: 1.08 1.13 0.89 0.93 1.00 OOO Oarrow_forwardAn existing urban freeway with 4 lanes in each direction has the following characteristics. Traffic data: Peak hour volume (in the peak direction): Trucks: PHF = 0.93 Geometric data: Lane width: Shoulder width: Total ramp density: Terrain: rolling 11 ft 6 ft 1.8 ramps per mile Determine the LOS in the peak hour. (Assume commuter traffic and assume no RVs.) LOS A LOS B LOS C LOS D LOS E LOS F mean speed density 7,010 veh/h 10% of peak hour volume Show the demand flow rate (in pc/h/In), mean speed (in mi/h), and density (in pc/mi/ln) for the given conditions. demand flow rate pc/h/In mi/h pc/mi/Inarrow_forward
- A 6-mile two lane highway in rolling terrain has the following data: Volume = 1500 veh/hr (two way); PT = 14%; PRV = 4%; peak fifteen minute volume is 415 vehicles. Percent no passing is 60% for a 50-50 directional split; lane width is 10.5ft, with a shoulder width of 4-ft; access points = 20 per mile. Assume the base free flow speed measured on the field is 65 mph. Determine the free flow speed at the highway section in mph.arrow_forwardAn eight-lane freeway (four lanes in each direction) is on rolling terrain and has 11-ft lanes with a 4- ft right-side shoulder. The total ramp density is 1.5 ramps per mile. The directional peak-hour traffic volume is 5400 vehicles with 11% heavy vehicles. The peak 15-minute volume is 1421 vehicles. What are the freeway’s density and level of servicearrow_forwardA 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)arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Traffic and Highway EngineeringCivil EngineeringISBN:9781305156241Author:Garber, Nicholas J.Publisher:Cengage Learning
Traffic and Highway Engineering
Civil Engineering
ISBN:9781305156241
Author:Garber, Nicholas J.
Publisher:Cengage Learning