Lecture 6 - Intersections Flashcards
points of a road or highway section where traffic flow converges (and sometimes diverges), and where direction of travel changes
Intersections
Intersections may be categorized according to
shape, type of structure and operation.
the configuration of the intersection.
Shape
dependent to number of legs.
Shape
elevated highways and roads
Grade separation
use of secondary roads to separate certain flows of traffic from the main traffic flow.
Channelization
Adding traffic signals and warnings to reduce traffic conflicts and minimize flow rate.
Signalization
Maximum number of legs is _____
four
_______ should be avoided
Staggered intersections
Main traffic flow should be near _______ as possible
straight
Roads should _____ at a small angle
not intersect
_______ intersections should be as far as possible from each other
2 consecutive
______ serves the purpose of an intersection: providing change in the direction of travel
Turning geometry
Conflicts may be classified as ______
merging, diverging or crossing conflicts
When two minor roads intersect, traffic may arrive the approach of the intersection in ______
any random fashion.
In this case, signals are necessary, but the simplest form of control is ___________
to have no signal at all.
Unsignalized Intersection is ruled by the use of :
Traffic signs
Available gaps on the road
Right-of-way rule
vehicle on the right has the priority
Right-of-way rule
For unsignalized intersections, when the number of through is almost equal to the number of turning vehicles, it can be considered as a ______
roundabout.
In roundabouts, all vehicle move __________
counterclockwise, one-way.
provide the capability to travel in the counter-flow direction.
• U-turns
_______ operations are very similar to roundabouts except that they favors a particular road, which is assumed to be the major road.
U-turn
The control of traffic in a signalized intersection is done by _______
separation in time
Eliminated the problematic crossing conflicts of the different movements of vehicles.
Grade Separation