Global Journal of Science Frontier Research, H: Environment & Earth Science, Volume 22 Issue 1

= 2 2 ∙ C ∙ (1 − ) Average delay per vehicle due to uniform arrivals can be calculated as: = 0.5 ∙ ∙ �1 − � � 2 1 − �min (1, ) � Where C- cycle length, X= Volume/Capacity (v/c) ratio. Level of service of the intersection is estimated based on the methods of HCM [30] as shown in Table 1. Level of service for signalized and unsignalized intersections LOS Signalized Unsignalized (second) A ≤ 10 ≤ 10 B > 10 – 20 > 10 – 15 C > 20 – 35 > 15 – 25 D > 35 – 55 > 25 – 35 E > 55 – 80 > 35 – 50 F > 80 > 50 IV. R esults and D iscussions a) Existing condition Details of the design of the intersection is presented, two major streets (Shota Rustaveli and Shakhrisabz streets) have 4 lanes in each direction, Mirabad minor streets have 3 lanes in each direction, and the circular island in the central part of the intersection has a diameter of 42 m. The maximum allowed speeds of vehicles on the roads of the city is 70 km/h.Based on the analysis the observations result of the phase timing and signal phase can be given in Table 2 and Figure 4. Signal cycle length is 90 seconds. Table 2: Phase timing Phase Green period (sec) Start time End time Duration A 3 44 41 B 3 44 41 C 56 82 26 D 56 82 26 E 3 44 41 F 56 82 26 G 49 82 33 H 49 82 33 I 3 42 39 J 56 82 26 K 3 42 39 L 87 42 45 Stage 1 Stage 2 Figure 4: Stage sequence diagram for Controller flow © 2022 Global Journals 1 Year 2022 22 Global Journal of Science Frontier Research Volume XXII Issue ersion I VI ( H ) Assessing the Operational Impacts of Road Intersection using PTV Vissim Microscopic Simulation Table 1: