Single Point Urban Interchange
Interchanges in heavily
developed urban areas must move an ever-increasing volume of traffic
through limited amounts of space. One way to maximize the flow of
traffic in urban areas is through use of Single Point Urban Interchanges.
The Single Point, also known as an X-interchange
or an Urban Diamond, is being used extensively in urban highway
construction and reconstruction across the country. The simple design
makes the most of safety, capacity and efficiency.
The name “Single Point” refers to
the fact that all thru-traffic on the arterial street – and
all the traffic turning left onto or off of the interchange –
can be controlled from a single set of traffic signals. These interchanges
allow long, gradual turns (helpful to larger vehicles like trucks
and buses), and have the ability to move more traffic through a
smaller amount of space. Smaller space means that single points
can typically be built within existing state property.
Not all interchanges along the I-70 corridor
will be appropriate for single points. Their use will be considered
primarily in heavily-developed areas such as Columbia and St.