Both interchanges will be improved.
IL 129 - Interchange Alternatives
STANDARD DIAMOND INTERCHANGE
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Four standard diamond ramps
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Ramps would have traffic signals at IL 129
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New intersection to the west connecting to a proposed Elion Boulevard Extension
DIVERGING DIAMOND INTERCHANGE
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Four standard diamond ramps
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Ramp intersections would accommodate the eastbound and westbound crossovers that will constitute the Diverging Diamond Interchange configuration
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New intersection to the west connecting to a proposed Elion Boulevard Extension
INTERSECTION OPTION FOR IL 129
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In addition to evaluating interchange alternatives, alternate intersection designs are being analyzed.
Lorenzo Road - Interchange Alternatives
MODIFIED TRUMPET INTERCHANGE
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Southbound exit is a loop ramp for EB & WB traffic, terminating at an intersection
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Northbound exit is a standard ramp terminating at an intersection allowing left and right turns
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Entrance ramp west of I-55 accepts vehicles from both directions on Lorenzo Road. North-south split occurs further down the ramp.
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Southbound I-55 traffic would merge using an auxiliary lane that extends to the IL 129 exit ramp
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Northbound I-55 traffic would proceed on a bridge over I-55 and under Lorenzo Road to merge just north of Lorenzo Road
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East frontage road coming from the south would become Lorenzo Road as it turns west towards I-55
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West frontage road intersection would be located a sufficient distance from the southbound ramps intersection to allow for adequate access control at the interchange
MODIFIED TRUMPET INTERCHANGE WITH FREE FLOW RAMP
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Same as Modified Trumpet with the exception of the southbound to westbound exit ramp. Instead of a loop going under Lorenzo Road, traffic exiting westbound would exit directly to Lorenzo Road as a free-flow right turn.
INTERSECTION OPTION FOR LORENZO ROAD
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In addition to evaluating interchange alternatives, alternate intersection designs are being analyzed including roundabouts.