ARTERIAL INTERCHANGE

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ARTERIAL INTERCHANGE

• Four exit ramp, split level (SPUI)
• With offset intersections
• SRF Consulting Group May 2006

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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
• Right turns 415
• Mainline through 2375
• EB Mainline (underpass) 1795
• Left turns 245
• Right turns 225
• Mainline through 1325
• NB Cross street (over crossing) 1510
• Left turns 480
• Right turns 120
• Throughs 910
• NB Cross street (over crossing) 1020
• Left turns 280
• Right turns 320
• Throughs 420
• Represents junction of principle arterial (55,000
  ADT) with minor arterial (25,000)

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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.
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Underpass Cross street follows a ridge.
Mainline is lowered under intersection with 17
feet of vertical clearance.
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FOUR EXIT RAMP SPLIT LEVEL SINGLE POINT (offset
intersections) INTERSECTION DETAILS
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.