Exam (elaborations)
TPG3700 Assignment 01 Answers Semester 1 2024
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- University Of South Africa (Unisa)
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Transportation Engineering, Pavement &Geometric Design
Assignment 1 Answers
Semester 1 2024
02 APRIL 2024
DUE DATE
0027 65 934 4052
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, 1.1 Transportation engineering intersects with various disciplines and these include
urban planning, environmental science, and even social sciences. This
interdisciplinary nature allows you to collaborate with professionals from diverse
backgrounds and gain a broader perspective.
1.2 U5b road class from TRH26: These local streets are found in residential areas and
almost exclusively serve residential traffic and possibly some public transport as
well as refuse and small delivery trucks. Residential local streets should not carry
more than about 1 000 vehicles per day or 100 vehicles during peak hours. If class
5b residential local street volumes exceed 5 000 per day, this is a criterion to
classify the road as a class 4b residential collector. Local residential streets should
be short blocks of less than 0.5 km, with one kilometre being the maximum for
safety reasons.
1.3 Given:
ADT = 10 000 veh/ day
K factor = 0.11
Annual traffic growth = 5%
Directional distribution factor = 0.5
Lane capacity = 650 veh/ h
1.3.1 𝐴𝐴𝐷𝑇 (𝑑𝑒𝑠𝑖𝑔𝑛 𝑦𝑒𝑎𝑟) = 𝐴𝐷𝑇 (𝑏𝑎𝑠𝑒 𝑦𝑒𝑎𝑟) × 𝑔𝑥
𝑔𝑥 = (1 + 0.01𝑖)𝑥
𝐴𝐴𝐷𝑇(𝑎𝑓𝑡𝑒𝑟 15 𝑦𝑒𝑎𝑟𝑠) = 10 000(1 + 0.01 × 5)15 = 20 879.28 𝑣𝑒ℎ𝑖𝑐𝑙𝑒𝑠 𝑝𝑒𝑟 𝑑𝑎𝑦
𝐷𝐻𝑉 = 𝑘 × 𝐴𝐴𝐷𝑇
𝐷𝐻𝑉 = 0.11 × 20 789.28 = 2 286.82 𝑣𝑒ℎ𝑖𝑐𝑙𝑒𝑠 𝑝𝑒𝑟 ℎ𝑜𝑢𝑟 (𝑏𝑜𝑡ℎ 𝑑𝑖𝑟𝑒𝑐𝑡𝑖𝑜𝑛𝑠)
𝐷𝐻𝑉 𝑖𝑛 𝑡ℎ𝑒 𝑑𝑒𝑠𝑖𝑔𝑛 𝑑𝑖𝑟𝑒𝑐𝑡𝑖𝑜𝑛 = 2287 × 0.5 = 1143.5 𝑣𝑒ℎ/ ℎ/𝑑𝑖𝑟𝑒𝑐𝑡𝑖𝑜𝑛
The directional design hourly volume after 15 years = 1143.5 veh/h/direction
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