2. The upstream traffic flow on a road with two lanes in the relevant direction is q₁= 1800 veh/hr with freeflow speed of vi-90 km/hr. As the result of a crash, one lane is blocked and flow is reduced to q2 = 900 veh/hr. The density in the queue is k2 = 70 veh/km. The value of time is GHC 10/hour/vehicle. Find: (a) The shockwave speed (vw) (b) The number of vehicles that will be in the queue if the traffic situation continues for 1 hour before the lane is cleared. (c) The cost of the crash to society in terms of delay (hint: use travel time in excess of freeflow travel time to determine this) (d) The amount to be paid to a freeway service patrol (tow truck service) if it can clear the crash in 30 minutes (e) The amount to be paid to a freeway service patrol if a variable message sign placed 2 km upstream of the crash site instantly advises travelers about a diversion to a frontage road 1 km upstream of the crash site

2. The upstream traffic flow on a road with two lanes in the relevant direction is q₁= 1800 veh/hr with freeflow speed of vi-90 km/hr. As the result of a crash, one lane is blocked and flow is reduced to q2 = 900 veh/hr. The density in the queue is k2 = 70 veh/km. The value of time is GHC 10/hour/vehicle. Find: (a) The shockwave speed (vw) (b) The number of vehicles that will be in the queue if the traffic situation continues for 1 hour before the lane is cleared. (c) The cost of the crash to society in terms of delay (hint: use travel time in excess of freeflow travel time to determine this) (d) The amount to be paid to a freeway service patrol (tow truck service) if it can clear the crash in 30 minutes (e) The amount to be paid to a freeway service patrol if a variable message sign placed 2 km upstream of the crash site instantly advises travelers about a diversion to a frontage road 1 km upstream of the crash site

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Intersection Design

An intersection is a location where two or more roads or railways meet or join. The traffic movement is controlled at the intersection that depends on its design and type. It governs the operation, efficiency, speed, capacity, and safety of the highways, airways, and railways. The movement of the pedestrian causes hazards and delays at the intersection.

Question

2. The upstream traffic flow on a road with two lanes in the relevant direction is qı= 1800
veh/hr with freeflow speed of vi=90 km/hr. As the result of a crash, one lane is blocked
and flow is reduced to q2 = 900 veh/hr. The density in the queue is k2 = 70 veh/km. The
value of time is GHC 10/hour/vehicle. Find:
(a) The shockwave speed (vw)
(b) The number of vehicles that will be in the queue if the traffic situation continues for 1
hour before the lane is cleared.
(c) The cost of the crash to society in terms of delay (hint: use travel time in excess of
freeflow travel time to determine this)
(d) The amount to be paid to a freeway service patrol (tow truck service) if it can clear the
crash in 30 minutes
(e) The amount to be paid to a freeway service patrol if a variable message sign placed 2
km upstream of the crash site instantly advises travelers about a diversion to a frontage
road 1 km upstream of the crash site

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