ARTERIAL INTERCHANGE. Four exit ramp, split level (SPUI) With offset intersections SRF Consulting Group – May 2006. VISSIM SCREEN SHOTS. Volumes used in simulation – year 2030 pm peak hour, for Mn Hwy 55 at Vicksburg Lane in Plymouth WB Mainline (underpass) 2910 Left turns – 120
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Four exit ramp, split level (SPUI)
With offset intersections
SRF Consulting Group – May 2006
Two signal controlled intersections
Signals on each level to handle left turns from ramps. Right turns have extended acceleration lanes to enter mainline and Yield control to enter cross street. Lower volume left turns from each roadway have complex alignment to create single intersection of opposing lefts while retaining a rectangular bridge shape.
Cross street follows a ridge. Mainline is lowered under intersection with 17 feet of vertical clearance.
FOUR EXIT RAMPSPLIT LEVEL SINGLE POINT (offset intersections)
Alternative design has separate “conventional exit ramp intersections, but uses one signal controller with “split” phasing for the exit ramp greens, less capacity, but narrower bridge.
Offset single intersection allows for exit ramp lefts to be made concurrently.