wo sets of students are collecting traffic data at two sections, xx and yy, of a highway 1500 ft apart. Observations at xx show that five vehicles passed that section at intervals of 3, 4, 3, and 5 sec, respectively. If the speeds of the vehicles were 50, 45, 40, 35, and 30 mi/h, respectively, draw a schematic showing the locations of the vehicles 20 sec after the first vehicles passed section xx. Also, determine (a) the time mean speed, (b) the space mean speed, and (c) the density on the highway.

wo sets of students are collecting traffic data at two sections, xx and yy, of a highway 1500 ft apart. Observations at xx show that five vehicles passed that section at intervals of 3, 4, 3, and 5 sec, respectively. If the speeds of the vehicles were 50, 45, 40, 35, and 30 mi/h, respectively, draw a schematic showing the locations of the vehicles 20 sec after the first vehicles passed section xx. Also, determine (a) the time mean speed, (b) the space mean speed, and (c) the density on the highway.

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter6: Fundamental Principles Of Traffic Flow

Section: Chapter Questions

Problem 5P

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Two sets of students are collecting traffic data at two sections, xx and yy, of a highway 500 metre apart. Observations at xx show that five vehicles passed that section at intervals of 3, 4, 3, and 5 secs, respectively. If the speeds of the vehicles were 50, 45, 40, 35, and 30 km/hr., respectively, draw a schematic showing the locations of the vehicles 20 sec after the first vehicle passed section xx. Also determine (a) the time mean speed, (b) the space mean speed, and (c) the density on the highway.
Two sets of students are collecting traffic data at two sections, xx and yy, of a highway 1400 ft apart. Observations at xx show that five vehicles passed that section at intervals of 3, 4, 3, and 5 seconds, respectively. If the speeds of the vehicles were found through radar gun measurements to be 50, 45, 40, 35, and 30 mph respectively, a. Draw a schematic showing the locations of the vehicles 20 seconds after the first vehicle passed xx. b. Determine the time mean speed C. Determine the space mean speed d. Determine the density on the highway e. Determine the flow Recalculate the space mean speed from Problem 1, using the empirical equation developed by Garber & Sankar: ūt = 0.966ūs + 3.541. Compare this answer to that calculated in Problem 1.
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