A 14-km streetcar line travels eastbound and westbound in shared ROW, and in each direction, it has stops every 250 m. Because the line is heavily used, it has a headway of 2.5 min and streetcars stop at each service stop. The running speed of streetcars between stops is 25 km/h (not accounting for stopping at stops). At each stop, streetcars spend 30 sec in acceleration, deceleration and dwell time. The terminal time is 10 min/terminal. The line is being redesigned into a high-quality streetcar line. The new streetcars have double the capacity of existing cars, and the headway of the new line will be increased to 5 min (although some passenger trips might be lost due to the increased stop spacing and increased headway, the travel demand is expected to be at least the same because of the overall performance improvement of the line). Two options are being considered: Option 1: The new stop spacing is 300m. The new line is expected to have a running speed of 40 km/h and the stop time (i.e. acceleration, deceleration and dwell) is 30 sec. Due to the expected improvement in service reliability, the terminal time would be reduced to 6 min at each terminal. Option 2: The new stop spacing is 400m. The new line is expected to have a running speed of 45 km/h and a slightly increased stop time of 35 sec. The terminal time would be reduced to 5 min at each terminal. a. Compute the percent of change in operating speed and cycle speed due to the new designs (comment on the better option in terms of speed). b. Compute the fleet size requirements in all cases (comment on the effects of the two proposed improvements on fleet size requirements and associated costs).
A 14-km streetcar line travels eastbound and westbound in shared ROW, and in each direction, it has stops every 250 m. Because the line is heavily used, it has a headway of 2.5 min and streetcars stop at each service stop. The running speed of streetcars between stops is 25 km/h (not accounting for stopping at stops). At each stop, streetcars spend 30 sec in acceleration, deceleration and dwell time. The terminal time is 10 min/terminal. The line is being redesigned into a high-quality streetcar line. The new streetcars have double the capacity of existing cars, and the headway of the new line will be increased to 5 min (although some passenger trips might be lost due to the increased stop spacing and increased headway, the travel demand is expected to be at least the same because of the overall performance improvement of the line). Two options are being considered: Option 1: The new stop spacing is 300m. The new line is expected to have a running speed of 40 km/h and the stop time (i.e. acceleration, deceleration and dwell) is 30 sec. Due to the expected improvement in service reliability, the terminal time would be reduced to 6 min at each terminal. Option 2: The new stop spacing is 400m. The new line is expected to have a running speed of 45 km/h and a slightly increased stop time of 35 sec. The terminal time would be reduced to 5 min at each terminal. a. Compute the percent of change in operating speed and cycle speed due to the new designs (comment on the better option in terms of speed). b. Compute the fleet size requirements in all cases (comment on the effects of the two proposed improvements on fleet size requirements and associated costs).
Traffic and Highway Engineering
5th Edition
ISBN:9781305156241
Author:Garber, Nicholas J.
Publisher:Garber, Nicholas J.
Chapter8: Intersection Control
Section: Chapter Questions
Problem 26P
Related questions
Question
Transcribed Image Text:A 14-km streetcar line travels eastbound and westbound in shared ROW, and in each direction, it has
stops every 250 m. Because the line is heavily used, it has a headway of 2.5 min and streetcars stop at
each service stop. The running speed of streetcars between stops is 25 km/h (not accounting for stopping
at stops). At each stop, streetcars spend 30 sec in acceleration, deceleration and dwell time. The terminal
time is 10 min/terminal. The line is being redesigned into a high-quality streetcar line. The new streetcars
have double the capacity of existing cars, and the headway of the new line will be increased to 5 min
(although some passenger trips might be lost due to the increased stop spacing and increased headway,
the travel demand is expected to be at least the same because of the overall performance improvement of
the line). Two options are being considered:
Option 1: The new stop spacing is 300m. The new line is expected to have a running speed of 40 km/h
and the stop time (i.e. acceleration, deceleration and dwell) is 30 sec. Due to the expected improvement in
service reliability, the terminal time would be reduced to 6 min at each terminal.
Option 2: The new stop spacing is 400m. The new line is expected to have a running speed of 45 km/h
and a slightly increased stop time of 35 sec. The terminal time would be reduced to 5 min at each
terminal.
a. Compute the percent of change in operating speed and cycle speed due to the new designs (comment
on the better option in terms of speed).
b. Compute the fleet size requirements in all cases (comment on the effects of the two proposed
improvements on fleet size requirements and associated costs).
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by step
Solved in 6 steps
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Recommended textbooks for you
Traffic and Highway Engineering
Civil Engineering
ISBN:
9781305156241
Author:
Garber, Nicholas J.
Publisher:
Cengage Learning
Traffic and Highway Engineering
Civil Engineering
ISBN:
9781305156241
Author:
Garber, Nicholas J.
Publisher:
Cengage Learning