JA driver with 20/20 vision traveling at 55 mph in the median lane desires to exit the free way at the exit ramp. If 5-in. letters are used, what is the minimum distance the sign should be placed ahead of the ramp exit? (Some assumptions that would be helpful are perception- reaction time 2 sec; exit speed 30 mph; deceleration rate = 4.80 ft/s 2; a driver with

JA driver with 20/20 vision traveling at 55 mph in the median lane desires to exit the free way at the exit ramp. If 5-in. letters are used, what is the minimum distance the sign should be placed ahead of the ramp exit? (Some assumptions that would be helpful are perception- reaction time 2 sec; exit speed 30 mph; deceleration rate = 4.80 ft/s 2; a driver with

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Q2/ A 3-phase traffic signal (cycle time 114 sec) is used at intersection of approach x, y, and z with equal effective green time at all approaches. Assuming that width of approach= 12 m, % left turning =30. show the following for one of the approaches: a- A sketch showing the sequence of all controller times appearing during one cycle indicating their values. b- Number of vehicles that could be discharge per cycle.
An approach to a pretimed signal has 25 seconds of effective green in a 60-second cycle. The approach volume is 500 veh/h and the saturation flow rate is 1400 veh/h. Calculate the average vehicle delay (in seconds) assuming D/D/1 queuing. Round off the final answer to whole number (no units).
8. (15 points) Calculate the "clearance period," the "yellow time," and the "all-red period" for a signalized intersection. Assume that the initial vehicle speed, intersection length, and vehicle length are 45 mi/h, 44 ft, and 22 ft, respectively. Also, deceleration rate is 10 ft/s and driver reaction time is 1 second.
A signalized intersection has two lane groups. The two WBT lanes (lane group #1) have a total volume of 863 pc/h and an average control delay of 24.5 seconds. The one WBL lane (lane group #2) has a volume of 203 pc/h and an average control delay of 36.5 seconds. What is the approach's LOS? Group of answer choices LOS A LOS D LOS C LOS B
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An intersection has a three-phase signal shown in the graph below. if he intersection deceleration rate for vehicles is 3.05 m/sec, length of vehicle is 6.0 m, the driver perception/reaction time is 1.0 seconds, and the Speed Limits are 75 km/hr for N-S approach & 55 km/hr for E-W approach; Calculate the All Red (AR) time for E-W approach (to the nearest 0.5 second) 183 m 16.8 m Select one O 1.5 seconds O 2.0 seconds O 1.0 seconds O3.0 seconds 2.5 seconds
For the same intersection in Problem 2, left-turning vehicles in the north-bound approach must seek appropriate gaps to cross the through movement. They need 5.5 seconds to cross one through lane, plus 0.5 second for every additional lane, to cross the opposite traffic. As you recall from the class, the intersection sight distance (ISD) is calculated by: ISD = 1.47 x S85 × tgap Do left-turning vehicles have sufficient sight distance to safely cross? You may use the design speed (45 mph) as a proxy for S85. To calculate tgap, there are a total of two lanes in the opposite traffic, as shown in the picture in Problem 2. Safely cross drivers see at least ISD ahead.
A right-turn-only lane at the west-east approach to a signalized intersection can store a maximum of five vehicles. The traffic volume at the approach is 900 veh/h and 20% of the traffic take right turns. The cycle time of the traffic light is 60 s, the green time allocated for right turns can accommodate a maximum of five vehicles. Determine the probability that there will be a backup of vehicles waiting to turn right thus blocking the lane.
A traffic signal control is being designed for a four-leg intersection on a divided highway with the characteristics shown in the table below. N-S Approaches E-W Approaches 16 12 3 2 50 40 0% 3% Determine the minimum green times (in s) for each approach if the effective crosswalk width in each direction is 8 ft and the number of pedestrians crossing during an interval is 24 in the N-S direction and 29 in the E-W direction. (Assume the average speed of pedestrians is 3.5 ft/s, and that it is feasible to disregard the yellow change and red clearance intervals.) S G min, N-S Gmin, E-W = Median width, (ft) Number of 12 ft lanes on each approach Design speed, mph Grade = S
An intersection has a three-phase signal with the movements allowed in each phase and corresponding analysis and saturation flow rates shown in the table below. Assume the lost time is 4 seconds per phase and a critical intersection v/c of 0.90 is desired. O 20.464 sec O 22.411 sec O 24.460 sec Phase O 21.035 sec Allowed movements Analysis flow rate Saturation flow rate Using v/c equalization ratio, calculate the effective green time for phase 2 NB L, SB L 330, 365 veh/h 1700, 1750 veh/h 2 NB T/R, SB T/R 1125, 1075 veh/h 3400, 3300 veh/h EB L, WBL 110, 80 veh/h 650, 600 veh/h 3 EB T/R, WB T/R 250, 285 veh/h 1750, 1800 veh/h