Transportation Final
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School
University of Florida *
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Course
4004C
Subject
Industrial Engineering
Date
Feb 20, 2024
Type
docx
Pages
5
Uploaded by windboolin24
Dr. Guo
TTE 4004C
12/7/23
Final Exam
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5. Chapter 6:
A)
During our final project
We had selected to analyze a segment of multilane highway
We calculated a breakpoint value for a freeway instead of a multilane highway
Error was corrected by comparing v
p
to 1400 instead of calculated BP value
B)
The most interesting part of this chapter to me was the sheer number of adjustment factors used to determine the level of service. Factors like lane width, shoulder width, median type, etc. are all used to determine these factors. Before taking this class, I would have thought the level of service was entirely determined by the average car speed relative to the speed limit.
C)
The most practical/useful part of this chapter is the skill of reading complex engineering tables and graphs. This chapter had a ton of tables used to find adjustment factors, and graphs like the speed vs. flow rate graph. This skill is highly applicable to all fields of engineering, not just transportation.
Chapter 7:
A)
During the signal design ICDP
Calculated total lost time using total yellow time instead of 1 second of yellow time
Noticed that cycle lengths were way too long to be correct
Corrected mistake by calculating total lost time by #phases*(AR+1 sec yellow+startup)
B)
The most interesting part of this chapter to me was the calculation for if a signal requires a protected left turn. This calculation makes intuitive sense, calculating the number of conflicts and measuring it against a baseline cutoff value. Before this class, I would have thought that the determination for a protected left turn was only a factor of how many lanes were being crossed.
C)
The most practical/useful part of this chapter is the concept of (semi)actuated signals. Magnetic induction coils embedded in the road can detect vehicles and command the signal to switch phases. This can be switched to a pre-timed signal based on factors like time of day or total traffic. Actuated signals are useful for smaller minor roads intersecting with a major road late at night when traffic volume is low. The major road can stay green almost all the time, unless
the induction coil detects a car at the minor road.
Chapter 8:
A)
During the destination choice ICDP
Tried to resolve U
2
and U
3
when question asked to change P
1
to 0.75
Could not solve problem, not enough equations for # of variables
Learned that U
2
and U
3
do not change due to U
1
changing
Able to solve for new U
1
(1 equation 1 variable)
B)
The most interesting part of this chapter to me was the idea that traffic to a destination can be determined by math and probability. This makes intuitive sense, as there had to be some mathematical way for developers to determine where to build their new grocery store/movie theater/restaurant. Learning this destination choice method was very interesting as I was able to learn a method that was always in the back of my mind, but I had never consciously thought about.
C)
The most practical/useful part of this chapter is the concept of destination choice. Having worked at a land development firm, I have seen traffic engineers determine these generated trips and how these trips affected the local roads around the development. It was interesting to learn that this is most likely the concept that they used (albeit probably something a little more sophisticated). This allows me to better communicate with the traffic engineer, as I now know what kinds of inputs they need to do their calculations.