Problem 23: A motorist traveling at 100 kph on an expressway intends to leave the expressway using an exit ramp with a maximum speed of 50 kph. At what point on the expressway should the motorist steps on her brakes in order to reduce her speed to the maximum allowable on the ramp just before entering the ramp? The section of the expressway has a downgrade of 3%. Acceleration is 3.5 m/sec.

Problem 23: A motorist traveling at 100 kph on an expressway intends to leave the expressway using an exit ramp with a maximum speed of 50 kph. At what point on the expressway should the motorist steps on her brakes in order to reduce her speed to the maximum allowable on the ramp just before entering the ramp? The section of the expressway has a downgrade of 3%. Acceleration is 3.5 m/sec.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

Q3. On a specific westbound section of highway, studies show that the speed density is a non linear relationship and it is, u = uf[1- (k/k;)3.5] The capacity (maximum flow) of the highway is 3800 veh/h and the jam density kj is 140 veh/km. (a) What is the speed (space man speed) of traffic at capacity? What is the free flow speed?
14. Free-flow speed of vehicles on a road section is 88 km/h. Jammed density is 228 veh/km. Determine the traffic density on the road if traffic flow is at a maximum level. Also determine the possible maximum flow for the road section and the average speed of vehicles at that maximum traffic flow rate. (114 veh/km, 5016 veh/h, 44 km/h)
4) Traffic on the eastbound approach of a signalized intersection is traveling at 35 mi/hr, with a density of 46 veh/mi/In. The duration of the red signal indication for this approach is 30 sec. If the saturation flow is 1900 veh/h/In with a density of 52 veh/mi/In, and the jam density is 125 veh/mi/In, determine the following: (i) The length of the queue at the end of the red phase (ii) The maximum queue length (iii) The time it takes for the queue to dissipate after the end of the red indication.
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 car is traveling at 15 m/s, when the traffic light 60 m ahead turns yellow. If the car decelerates, the time needed to stop the car at the light. 7 secs O 8 secs 5 secs 6 secs
A multilane highway (two lanes in each direction) is on level terrain. The free-flow speed has been measured at 45 mi/h. The peak-hour directional traffic flow is 1300 vehicles with 8% heavy vehicles. If the peak-hour factor is 0.85, determine the highway’s level of service. Answer: LOS:C
7.24 Vehicles arrive at an approach to a pretimed signalized intersection. The arrival rate over the cycle is given by the function v(t) = 0.22 + 0.012t [v(t) is in veh/s and t is in seconds]. There are no vehicles in the queue when the cycle (effective red) begins. The cycle length is 60 seconds and the saturation flow rate is 3600 veh/h. Determine the effective green and red times that will allow the queue to clear exactly at the end of the cycle (the end of the effective green), and determine the total vehicle delay for this approach over the cycle (assuming D/D/1 queuing).
Traffic on a freeway gives a Greenshield's traffic flow relationship expressed as: Q = 60k-0.16667k? At 10AM, an accident occurs 4 km downstream of an access ramp. The vehicles pull onto the shoulder of the roadway, but traffic passing the accident area slows to 10 kph as drivers survey the damage on the side of the road. A patrol car enters the freeway via access ramp, also at 10AM. Upon entering the freeway, the patrol car notes that traffic on the freeway is moving along at about 40 kph. Determine the following: 1. Capacity flow of the highway 2. Traffic shockwave created by the road accident 3. Time in AM the patrol car will reach the accident zone 4. Plotted traffic shockwave line in the Q-k traffic model diagram
. An automobile traveling at a rate of 30 ft/sec is approaching an intersection. When the automobile is 120 ft from the intersection, a truck traveling at the rate of 40 fi/sec crosses the intersection, The automobile and the truck are on roads that are at right angles to each other. How fast are the automobile and the truck separating 2 sec after the truck leaves the intersection?
A truck travels along a straight, level road at the speed of 76ft/sec. when the driver is forced to apply the breaks to avoid an accident. If the truck undergoes a constant deceleration of 6ft/sec2, how far does the truck travel before coming to a complete stop?
A Class I two-lane highway has a base free-flow speed of 110 km/h. Lane width is 3.6 m, and shoulder width is 2.4 m. There are six access points per kilometre. The roadway is located in rolling terrain with 40 percent no-passing zones. The two-way traffic volume is 1000 veh/h, with a PHF of 0.90. The directional split is 70:30. Traffic includes 10 percent trucks and 5 percent recreational vehicles. The length of the analysis segment is 9.5 km. Compute service flow rate for the two-way segment.
A six-lane freeway (three lanes in each direction) currently operates at maximum LOS C conditions. The lanes are 11 ft wide, the right-side shoulder is 4 ft wide, and there are two ramps within three miles upstream of the segment midpoint and one ramp within three miles downstream of the segment midpoint. The highway is on rolling terrain with 10% heavy vehicles, and the peak-hour factor is 0.90. Determine the hourly volume for these conditions in veh/h. Round of your answer to whole number. fLW = 1.9, fRLC = 0.80, PHF = 0.90, N = 3 lanes PT = 0.10, ET = 3.0.