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Unformatted text preview: CIVL 261 Traffic and Transportation Engineering Tutorial 1A Quiz 2 Name: Student ID: Week 3, 20 Feb 2009 Question 1: Frank observes a cyclic traffic flow on Queen’s Road East from his table through the coffee shop window. Three groups of vehicles arrived in the 15min period. Red vehicles arrive with a rate of 5veh/min at speed 50km/hr. Green vehicles arrive at 60km/hr with headway of 30sec. 20 Purple vehicles arrive, each at speed 80km/hr. Compute the space mean speed and time mean speed of the traffic flow. … … Coffee shop window observed for 15mins v G =60km/hr, h G =30s v R =50km/hr, ? =5veh/min v P =80km/hr, 20veh arrives Solution: Volume: Q R =5*60 =300 veh/hr Q G =3600/30 =120 veh/hr Q P =20*60/15 =80 veh/hr The time mean speed is: Vt =(300*50+120*60+80*80)/500 =57.20km/hr Consider if Dr. Poon takes a photo for a road segment of length 1000m from the top of the Hopewell Centre, he will find 6 red, 2 green, and 1 purple vehicles. This is derived by considering the density of Centre, he will find 6 red, 2 green, and 1 purple vehicles....
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 Spring '09
 Lee
 Transportation Engineering

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