of 3 At one location of a highway, if flow rate is measured as 600 veh / hr, what is the average headway (in second) between vehicles?

An expressway off-ramp consisting of a single lane leads directly to a tollbooth. The rate of arrival of vehicles at the expressway can be considered to be Poisson with a 6-24 www.Civil08.com - The Download Monster Chapter 6 Fundamental Principles of Traffic Flow 263 mean of 50 veh/h, and the rate of service to vehicles can be assumed to be exponen- tially distributed with a mean of 1 min. (a) What is the average number of vehicles waiting to be served at the booth (that is, the number of vehicles in queue, not including the vehicle being served)? (b) What is the length of the ramp required to provide storage for all exiting vehicles 85% of the time? Assume the average length of a vehicle is 20 ft and that there is an average space of 5 ft between consecutive vehicles waiting to be served. (c) What is the average waiting time a driver waits before being served at the toll- booth (that is, the average waiting time in the queue)?

A section of highway has a linear speed-density relationship. The capacity of the roadway is 3150 veh/hr and this capacity is observed at an average speed of 35 mi/hr. What speed is observed when traffic is uncongested with a flow of 2500 veh/hr? What is the density of traffic when it is congested and operating at 75% of the capacity?

A lane on a freeway displays the following characteristics: (a) the average headway between vehicles is 2.8s, and (b) the average spacing between vehicles is 235 ft. What is the rate of flow for the lane? What is the density of traffic in the lane? What is the average speed (in mph)?

A segment of rural freeway is being designed for a FFS of 70 mph through rolling terrain. The directional (i.e. one-way) design volume is 3,000 vehicles per hour. If 10% of the design volume is expected to be heavy vehicles (i.e. trucks and buses), what is the heavy vehicle adjustment used to determine the flow rate? Provide you answer to the nearest hundredths. Response Feedback: f₁ HV 1 1+ · + P ₁ (E₁ − ¹) T T -where PT-0.1, ET=3.0

A section of highway has a speed-flow relationship of the form q = a*u*u + b*u (a and b are coefficients to be determined). It is known that at capacity (which is 3100 veh/h) the space-mean speed of traffic is 35 km/h. Determine the speed when the flow is 1500 veh/h and the free-flow speed.

1) 1) A section of highway has the following flow-density relationship: q-50k-0.156k² What is the capacity (maximum flow) of the highway section, the space mean speed at capacity, and the density when the traffic flow on the highway is at one-quarter of its capacity? 2) An observer has determined that the time headways between successive vehicles on a section of highway are exponentially distributed (arrival of vehicle is Poisson distribution) and that 60% of the headways between vehicles are 13 seconds or greater. If the observer decides to count traffic in 30-second time intervals, estimate the probability of the observer counting exactly four vehicles in an interval.

The traffic intensity of a certain freeway is 0.833. The arrival rate of vehicles at a certain intersection (stop sign) is 200 vehicles per hour. Compute the service rate in vehicles/hr. *

Measurements from a single-lane roadway reveal that the average spacing and headway between passing vehicles are 200 ft and 2.4 seconds, respectively. What is the flow [veh/hr], density [veh/mi] and average speed [mi/hr] of traffic on this roadway?

A section of highway has a linear speed-density relationship. The capacity of the roadway is 3,751 veh/hr and this capacity is observed at an average speed of 40 mi/hr. What speed is observed when traffic is congested with a flow of 1,053 veh/hr?