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In semi control or partial control, the drivers are gently guided to avoid
conflicts.
Channelization and traffic rotaries are two examples of this.
- Channelization: The traffic is separated to flow through definite
paths by raising a portion of the road in the middle usually called as islands
distinguished by road markings.
The conflicts in traffic movements are reduced to a great extent in such a
case.
In channelized intersections, as the name suggests, the traffic is directed to
flow through different channels and this physical separation is made possible
with the help of some barriers in the road like traffic islands, road markings
etc.
- Traffic rotaries: It is a form of intersection control in which
the traffic is made to flow along one direction around a traffic island.
The essential principle of this control is to convert all the severe conflicts
like through and right turn conflicts into milder conflicts like merging,
weaving and diverging.
It is a form of `at-grade' intersection laid out for the movement of traffic
such that no through conflicts are there.
Free-left turn is permitted where as through traffic and right-turn traffic is
forced to move around the central island in a clock-wise direction in an
orderly manner.
Merging, weaving and diverging operations reduces the conflicting movements at
the rotary.
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