Civil Engineering Design Speed Analysis: Curves and Sight Distances

Faculty of Engineering and Architectural Science Department of Civil Engineering Course Number Course Title Semester/Year Instructor Section No. Group No. Submission Date Due Date Lab/Tut Assignment NO. Assignment Title Name Student ID Signature* xxxx12345 (Note: remove the first 4 digits from your student ID) *By signing above you attest that you have contributed to this submission and confirm that all work you have contributed to this submission is your own work. Any suspicion of copying or plagiarism in this work will result in an investigation of Academic Misconduct and may result in a “0” on the work, an “F” in the course , or possibly more severe penalties, as well as a Disciplinary Notice on your academic record under the Student Code of Academic Conduct, which can be found online at: www.ryerson.ca/senate/current/pol60.pdf

Q4.1.1 Which two horizontal curves have the lowest Effective Design Speed? - Horizontal curves have the same speed, 50mph, throughout the road. Q 4.1.2: Which two vertical curves have the lowest Effective Design speed ? The segments of road with grades ranging from 73+81.89 to 77+09.974, and from 80+38.058 to 83+66.142, have been designed to accommodate lower effective speeds of 33mph and 26mph, respectively. Specifically, the first segment is a crest curve, while the second one is a sag curve.

Q4.1.3 In each direction of travel (decreasing and increasing), identify the segment with the shortest available Stopping Sight Distance. - The stopping sight distance is at its minimum in two segments of the road: between 41+58.00 and 45+60.00, and between 101+82.00 and 107+10.00. In the former segment, the stopping sight distance is 198ft, while in the latter, it is 180ft.

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Q4.2.1- What are the approximate locations of any red “flags” on the speed profile (indicating speed differentials between adjacent design elements of >12 mph)? - There is a red flag at Station 40+32.470 with a speed differential of 18mph at Table 3

And another red flag at station 114+53.874 with a speed differential of 19 mph at table 6 Table 6. Speed Differential of Adjacent Design Elements, Decreasing Stations Q4.2.2 What are the approximate locations of any yellow “flags” on the speed profile (indicating speed differentials between adjacent design elements of >6 mph, <12 mph)? - Table 3 lists three yellow flag stations located at 0.000, 94+03.489, and 104+00.096 along the road. These stations have differential speeds of 8, 8, and 7mph, respectively. In Table 6, there is one yellow flag station located at 5+32.943 with a differential speed of 6mph. Q 4.2.3: How do the speed profiles differ by direction of travel? - Yellow flags are typically placed at the ends of road segments when the stations are increasing. However, when the stations are decreasing, yellow flags are usually placed in the central segments. Despite having similar V85 speeds at their respective locations, these segments have different curve types. Q 4.2.4 Which two sections have the greatest differential between the estimated operating speed.(V85) and the design speed (Vdesign)? Where does this occur? - For increasing stations, it starts at 45+07.470, it happens in section 40+32.470. For decreasing stations, it starts at 107+91.532, it happens in section 114+53.784.

Q 4.2.5: What is the greatest speed differential? - Greatest speed differential is 19mph Q 4.2.6: What is the start station of the curve with the greatest speed differential? - The start station of the curve with the greatest speed differential is 107+91.532

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Assignment 9

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