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 3P
To determine
The possible situations that would require adjustments from the base condition for freeway capacity analysis.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
What are the main considerations when a new interchange is proposed? List the main considerations and briefly discuss each one.
A Class II two-lane highway needs to be redesigned for an area with rolling terrain. During the peak hour, 380 vehicles are traveling in the analysis direction and 300 vehicles are traveling in the opposing direction. The PHF is 0.92. The traffic stream includes 8% large trucks, 2% buses, and no recreational vehicles. What is the maximum percentage of no-passing zones that can be built into the design with LOS
maintained?
A Class II two-lane highway needs to be redesigned for an area with rolling terrain. During the peak hour, 380 vehicles are traveling in the analysis direction and 300 vehicles are traveling in the opposing direction. The PHF is 0.92. The traffic stream includes 8% large trucks, 2% buses, and no recreational vehicles. What is the maximum percentage of no-passing zones that can be built into the design with LOS C maintained?
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
- A particular roadway segment has a 6000-ft section of 3% upgrade, followed by a 5000-ft section of 5% upgrade. The traffic on the road includes 8% trucks and 4% recreational vehicles. Determine the PCEs.arrow_forwardQuestion - A freeway is to be designed to provide LOS C for the following conditions: design hourly volume of 5600 veh/h; PHF: 0.92; trucks: 6%; free flow speed: 112 km/h; no lateral obstructions; rolling terrain; total ramp density of 0.5 ramps /km. Determine: Number of 3.6 m lanes required in each direction. Please give the correct answerarrow_forwardList 10 key factors of congestion mitigation that may influence freeway mobility performance.arrow_forward
- ramps within 3 miles upstream and downstream of the segment midpoint. It is on rolling terrain with 10% heavy vehicles and is operating at capacity with a peak-hour factor of 0.9. If the road is expanded to four 11-foot lanes with a 2-foot right shoulder, and traffic after the expansion is projected to increase by 10% with the same heavy vehicle percentage and peak-hour factor, what is the new LOS and estimated density? P-22 Chapter 6 Problems hour. What would be the LOS before and after the heavy vehicles are allowed on the upgrade (assuming 50% SUTs and 50% TTs.)? 6.21 A multilane highway has four lanes (two lanes in each direction) and a measured FFS of 55 mi/h. The directional peak-hour volume is 1900 vehicles (the peak-hour factor is 0.80). One upgrade is 5% and is 0.62 mi long. Currently, heavy vehicles are not permitted on the highway, but local authorities are considering allowing heavy vehicles on this upgrade. If this is done, they estimate that 150 heavy vehicles will use…arrow_forwardAn urban freeway presently has three 12-ft lanes on a 3 percent upgrade 1.75 mi long. The traffic includes 8 percent trucks and buses (recreational vehicles are negligible). There are no lateral obstructions. Design speed is 70 MPH. (a) What is the present capacity of the upgrade? (b) How much could the capacity be increased by widening and remarking the existing traveled way to provide four 10-ft lanes up the grade?arrow_forwardAn existing rural freeway in rolling terrain is to be analyzed to determine LOS using the following information: Number of lanes in each direction: 2 Peak hour volume: 2640 veh/h 18% trucks 2% recreational vehicles PHF _ 0.91 Lane width: 12 ft Lateral clearance: 10 ft Average interchange spacing: 3 miarrow_forward
- A basic segment of a rural freeway has the following characteristics: • Four-lanes (two lanes in each direction)%3B There is one ramp within 3 miles upstream, and 2 ramps within 3 miles downstream; 10-ft lanes; Right shoulder width of 4 ft; • Level terrain;. 10% trucks and 5% buses in the vehicle stream. Calculate the FFS at this freeway section and then determine the level of service (LOS) when the flow rate is 1740 pc/h/In. (Write the answer for the LOS in the box below).arrow_forwardEvaluate common highway faults and highlight effective maintenance regimes as preventative measuresarrow_forwardPrincipal criteria in designing highway. Explain each criteria.arrow_forward
- The City of Gainesville and FDOT, in an attempt to proactively address the growing need for capacity in the western area of Gainesville, has identified a potential alignment for a new freeway to UF campus. The FDOT district has contracted you to design this new freeway and identify any additional concerns with this potential freeway. Note that this is an open question, and you may need to make the following assumptions during your work: Lane width (e.g., 12 ft. or 11 ft) Shoulder width (e.g., 6 ft.) Interchange density (e.g., 1 interchange/2 miles) Number of lanes (e.g., 3 or 2 lanes each direction) Hourly volume V= * D*AADT (e.g., =10%, directional distribution D=50%) A design structural number (e.g., SN= 5.0) The following traffic characteristics are expected on this freeway: AADT=30,000 veh PHF=0.95 85% passenger cars Two 2-kip single axles 7% RVs One 10-kip single axle One 24-kip tandem axle 5% single-unit trucks One 12-kip single axle Two 32-kip tandem axles 3% tractor-trailer…arrow_forward4. TXDOT is working on the design of I-69 north of Victoria. They project a demand volume of 52,000 vehicles per day with a K factor of 0.12 and a directional distribution of 56/44 in level terrain with a target LOS of B and 17% trucks and buses. They plan to have roughly one diamond interchange every 2 miles. What number of lanes is required to achieve these design requirements? What LOS would occur for a typical 4-lane rural interstate design? DHV = AADT * K * D DHV – design hourly volume AADT - average annual daily traffic K- peak hour adjustment factor D- directional distribution (make design conservative)arrow_forwardAn existing urban freeway in rolling terrain is to be analyzed to determine LOS using the following information: Number of lanes in each direction: 3 Peak hour volume: 3300 veh/h (in the peak direction, mainly commuter traffic) 8% trucks 2% recreational vehicles PHF=0.95 Lane width: 11 ft Lateral clearance: 4 ft Average interchange spacing: 1.0 mile Base FFS: 70 mpharrow_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