Traffic flow on a three-lane (one direction) freeway can be described by the Greenshields model. One lane of the three lanes on a section of this freeway will have to be closed o undertake an emergency bridge repair that is expected to take 2 hours. It is estimated that the capacity at the work zone will be reduced by 35 percent of that of the section ust upstream of the work zone. The mean free flow speed of the highway is 50 mi/h and the jam density is 115 veh/mi/In. If it is estimated that the demand flow on the highway during the emergency repairs is 85 percent of the capacity, using the deterministic approach, determine the following. (a) the maximum queue length (in veh) that will be formed X Your response differs from the correct answer by more than 10%. Double check your calculations. veh (b) the total delay (in h) h (c) the number of vehicles that will be affected by the incident veh (d) the average individual delay (in min) min

Problem 2. Consider a freeway section with three lanes in each direction and with a length of 1.25mi (2km) and a +5% grade. In this freeway, the directional peak-hour volume is 3,800 veh/h, from which 76 are trucks and 152 are transit buses. The maximum 15-min volume within the hour of analysis is 1,055 vehicles. The lane widths are 12 ft (3.6m), and shoulder widths are 10 ft (3.1m). There are 2 exit ramps and 1 entrance ramp in the 3 miles in the upstream section and 1 exit ramp and 2 entrance ramp in the 3 miles in the downstream section (consider the same ramp density if using international (km) units). All transit buses will be removed from traffic since the transit service will be replaced by a commuter rail service. However, by removing buses, new additional passage car demand is expected. It is estimated that for each removed bus, 7 new passenger cars will be added to the original traffic volume of 3,800 veh/h. Question: Determine the change in speed and traffic density before…

A California freeway has four lanes in each direction and carries a traffic volume of 4000 veh/h. The lane width is 11 ft, right shoulder lateral clearance is 5 ft, and there are four interchanges in every six miles of this freeway. Each interchange has two ramps, one for entry and one for exit. There is a 1 mile long section of this freeway that has a 6% upgrade. It is known that on this segment 5% of the traffic is SUTs and 5% is TTs. Peak-hour factor (PHF) is 0.90. Determine the LOS for this segment.

8. A two-lane highway is expected to serve ADT of 5000 veh, find DHV and DDHV in veh and pcu if the following information is given: K=0.1, D=0.6 Traffic composition includes 80 passenger cars and 20% trucks.

Consider the freeway and traffic conditions described in Problem 6.3. If 180 of the 1800 vehicles observed in the peak hour were large trucks and buses, what would the level of service of this freeway be on a 5-mi, 6% downgrade?

A six-lane divided miltilane highway (three lanes in each direction) has a measured FFS of 70 mi/h. It is on rolling terrain with a traffic stream consisting of 17% heavy vehicles. One direction of the highway currently operates at maximum LOS C conditions, and it is known that the highway has PHF = 0.70. How many vehicles can be added to this highway (ignore capacity), assuming the proportion of vehicle types remain the same but the peak-hour factor increases to 0.89. (Note: range +/-3, round to the nearest vehicle)

Q: The expected daily traffic (AADT) for tow-way on a major six-lane flexible pavement highway consists of trucks of type 1 and 2 with equivalency factors as follow: type1 truck 1000/day(2. way) type2truck 500/day (2 way) 24kips(single) 24Kips(Tandem) 12kips(single) Equiv. 3.22 0.450 0.010 factor 24kips(single) 3.22 12 kips(Tandem) 0.026 Performance penod-15 years, annual growth rate=4%, tirectional distribution percent -70%, design lane percent 80 %, required structural number for subgrade = 5.7, asphalt concrete surfacing layer coefficient (4,-0.42), asphalt concrete base layer coefficient (a₂-034), gravel and soil subbase layer coefficient (93-0.12) and the modify drainage coefficient (m = 1.0) for all pavement courses Find the equivalent single axle load (ESAL) and draw a simple sketch of designed three pavement thickness courses with all necessary calculations?

The average daily traffic on a stretch of road is 300 commercial vehicles per lane per day. Design traffic repetitions for 10 years when vehicle damage factor is 2.5 and traffic growth rate is 7% is

The relationship between flow and density on a four-lane highway (two lanes per direction) is known to follow GreenShiled's model, with a free flow speed of 100 km/h and a jam density of 80 veh/km/lane. One of the two lanes of the EB direction will be closed for an entire month for maintenance. The traffic demand for the highway on a typical weekday is shown in the table below. a) What is the maximum length of the queue upstream of the bottleneck during both the morning and afternoon peak hours? b) At what time will the morning and afternoon queues be dissipated? c) Draw the shock wave diagram (for the entire day) showing shock wave speeds, critical times, and distances. Time 7:00 AM - 9:00 AM 9:00 AM 3:00 PM 3:00 PM 7:00 PM 7:00 PM–11:00 PM 11:00 PM 7:00 AM Average Demand (vph) 3000 1500 3200 1200 400

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?