This is an intersection
that prevents direct crossing and left-turn movements from the side
road. These side road movements are made indirectly by making a right
turn, traveling about a quarter-mile on the divided main road, and
then making a U-turn to proceed in the opposite direction on the main
road toward the intended destination.
At the original intersection
location, both left and right turns from the divided main road, as
well as right turns from the side road to the main road, remain as
direct turns. The J-turn does not require mainline through traffic to
stop or yield.
J-turns reduce the number of intersection conflict points from 42 to
24 and reduce the right-angle conflict points from 24 to four. The
remaining conflict points are merging, exiting, or lane-changing
maneuvers, which are not right angle and generally result in lower
severity crashes. Studies done by the National Cooperative Highway
Research Program show J-turns provide significant reduction in
right-angle, “far” side crashes.
A J-turn is expected to reduce a significant number
of the severe, right-angle, “far” side crashes. Relative to other
improvement concepts, it is a low-cost treatment that can be quickly
implemented, does not require property acquisition or relocation of
homes and businesses, and minimizes environmental impact.
WIS 32 interchange is relatively close to the location where the west
U-turn would be located for County U. Therefore, WIS 32 will be used to
allow motorists to make a U-turn.
For the U-turn location to the
east, a horizontal curve exists near the intersection. A safe U-turn
location was not available within approximately a quarter-mile of the
intersection. The County VV intersection can be used to make a U-turn.
Motorists on County U can also travel west on Glendale Avenue or
County VV and access WIS 29 at County VV.
Yes. The J-turn at WIS 29/County VV will be designed to accommodate
the turning widths of large vehicles, including large tractor-trailer
combinations and school buses. A weave analysis will also be performed
during the design process to ensure that the median crossovers are
constructed at an appropriate distance from the side road
The weave analysis will determine this distance by
evaluating available gaps in traffic on WIS 29 in combination with the
length required for larger vehicles to turn onto WIS 29, accelerate,
and merge safely into the median lane so that they can negotiate into
the median crossovers.
is expected that the proposed J-turn will provide a safer intersection
than the existing configuration even as traffic volumes continue to
increase on WIS 29. Because of this, the J-turn will continue to be
effective until an interchange is constructed at the WIS 29/County
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Last modified: April 12, 2013