The cumulative arrival and departure curve of one cycle of an approach lane of a signalized intersection is shown in the adjoining figure. The cycle time is 50 s and the effective red time is 30s and the effective green time is 20 s. What is the average delay? Cumulative Arrival Cumulative arrival or departure (No. of vehicles) 40 30 20 10 0 0 10 20 30 Time (s) 40 (6) Cumulative Departure 50

The cumulative arrival and departure curve of one cycle of an approach lane of a signalized intersection is shown in the adjoining figure. The cycle time is 50 s and the effective red time is 30s and the effective green time is 20 s. What is the average delay? Cumulative Arrival Cumulative arrival or departure (No. of vehicles) 40 30 20 10 0 0 10 20 30 Time (s) 40 (6) Cumulative Departure 50

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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Observers stationed at two sections XX and YY, 1000 ft apart on a highway, record the arrival times of four vehicles as shown in the table below. Vehicle Section XX Section YY A T0 T0 + 14.33 sec B T0 + 3.76 sec T0 + 18.14 sec C T0 + 7.94 sec T0 + 22.06 sec D T0 + 12.13 sec T0 + 27.87 sec If the total time of observation at XX was 20 sec, determine (a) the time mean speed, (b) the space mean speed, (c) the flow at section XX, and (d) the density on the highway
The cumulative arrival and departure curve of one cycle of an approach lane of a signalized intersection is shown in the adjoining figure. The cycle time is 50 s and the effective red time is 30 s and the effective green time is 20 s. What is the average delay? Cumulative --- Arrival A Cumulative arrival or departure (No. of vehicles) TO 30 #1 Departure
Match the term with its definition. ✓ phase interval cycle ring barrier A. the time given to opposing left turn movements B. a continuous sequence of phases c. the total time to complete one sequence of signalization for all movements at an intersection D. reference within the cycle at which time a phase in each ring terminates, separating conflicting movements such as east-west from north-south E. the green, change and clearance intervals assigned to a specific movement or movements of traffic F. duration of time during which the signal indications do not change
QUESTION 3 Match the term with its definition. ✓ phase ✓ interval ✓ cycle ✓ring ✓ barrier A. the total time to complete one sequence of signalization for all movements at an intersection B. a continuous sequence of phases C. reference within the cycle at which time a phase in each ring terminates, separating conflicting movements such as east-west from north-south D. the time given to opposing left turn movements E. duration of time during which the signal indications do not change F. the green, change and clearance intervals assigned to a specific movement or movements of traffic
For a given control stations the following data are: (A) Typical hourly variation of traffic volume. Hour volume Hour volume 6:00-7:00 am 185 6:00-7:00 402 7:00-8:00 254 7:00-8:00 489 8:00-9:00 316 8:00-9:00 456 9:00-10:00 376 9:00-10:00 327 10:00-11:00 289 10:00-11:00 210 11:00-12:00 259 Mid. night 175 12:00-1:00 pm 226 12:00-1:00 83 1:00-2:00 221 1:00-2:00 47 2:00-3:00 286 2:00-3:00 18 3:00-4:00 427 3:00-4:00 25 4:00-5:00 354 4:00-5:00 56 5:00-6:00 341 5:00-6:00 90 (B) Typical daily variation of traffic volume. Day Volume Sunday Monday Tuesday Wednesday Thursday Friday Saturday 3380 4223 3086 3119 3146 3409 3843 (C) Typical seasonal variation of traffic volume. Month Jan. Feb. Mar Apr May June Volume 80000 74375 85625 101250 104375 109500 Month July 111500 Aug. Sep. 119250 Act. Nov. Dec. Volume 121000 105000 92880 87625 1) The traffic volume count (8:00-9:00) am was 665 vph and (4:00-5:00) pm is was 535vph made on Wednesday/ February; Find the ADT and AADT by using the previous…
An observer notes that an approach to a pretimed signal has a maximum of eight vehicles in a queue in a given cycle. If the saturation flow rate is 1440 veh/h and the effective red time is 40 seconds, how much time will it take this queue to clear after the start of the effective green (assuming that approach capacity exceeds arrivals and D/D/1 queuing applies) (in seconds)? Round off the final answer to whole number. Blank 1 Blank 1 Add your answer
Transportation Engineering Roll No. - 69 do the numerical part 2. Explain with the help of sketches various types of highway intersections. The 15 minute design traffic volume on cross road 1 and 2 during peak hour are observed as 180+R.No. and 150+R.No. vehicles per lane respectively. If the amber times required are 4 and 3 seconds respectively for two roads, design the signal timing by trial cycle (or exact) method. Assume average time headway of 2.5 sec during green phase. CO3
Exercise 6 A three phase signal design is given below. ● ● ● Hic Signal What is the sum of the flow ratios for the critical lane groups? What is the total lost time for a signal cycle assuming 2 seconds of clearance lost time and 2 seconds of startup lost time per phase? What is the cycle length using Webster Method? EB - Phase 1 2 3 -200 20 SB 30 100- Lane group SB NB EB WB 400 1000 NB 150 50 300 30 WB Saturation Flows 3400 veh/hr 3400 veh/hr 1400 veh/hr 1400 veh/hr
Select the true items related to traffic signal design. Select only the four correct answers. For the dissipation of queue, the average saturation flow should be smaller than arrival flow. Intergreen is the time duration from the end of green time of a particular phase to the beginning of green time for the other phase. Average saturation flow is smaller than saturation flow. Key tasks of traffic signal design involve phasing, red time allocating and green time allocating. Intergreen is the time duration from the end of green time of a particular phase to the beginning of green time for the same phase. For the dissipation of queue, the average saturation flow should be greater than arrival flow. Average saturation flow is greater than saturation flow. Key tasks of traffic signal design involve phasing, cycling and green time allocating.
Problems 1. Traffic volumes on a four-lane freeway (two lanes in each direction) were counted manually from an overhead location, resulting in the data shown here. The desire was to obtain continuous 15-minute counts for each lane of the freeway for a two-hour period surrounding the morning peak hour. 11On 400 linc W Data for Problem 1 Eastbound Westbound Time of Count (PM) Lane 1 Lane 2 Lane 1 Lane 2 4:00-4:12 4:15-4:27 4:30-4:42 4:45-4:57 5:00-5:12 360 310 350 285 380 330 370 300 370 340 5:15-5:27 5:30-5:42 5:45-5:57 345 280 340 260 310 320 From the data shown, determine the following: (a) Continuous 15-minute volumes for each period and each lane. (b) The peak hour, peak hour volume, and peak hour factor (PHF) for each direction of flow and for the freeway as a whole. (c) Directional flow rates during each 15-minute count period.
0-2| Traffic volume data has been collected for 10 min time intervals as shown below. Find the total hourly volume, flow rate and PHF. Time 7:30-7:40 7:40-7:50 7:50-8:00 8:00-8:10 8:10-8:20 8:20-8:30 Volume 250 280 300 200 150 130
The results of a speed study are given in the form of a frequency distribution table. Find the time mean speed and space mean speed. speed rang: (2-5),(6-9),(10-13),(14-17)frequency: 1,4,0,7