The Illinois Department of Transportation (IDOT) is conducting a Preliminary Engineering and Environmental (Phase I) Study for the purpose of evaluating suitable traffic control alternatives that address the safety and operations of traffic currently experienced at the intersection of Hibbard Road at Illinois Road in the Villages of Wilmette and Northfield.
This intersection is an all-way stop controlled intersection with a single luminaire located in the northeast corner of the intersection. The land surrounding the intersection is mainly residential homes, the Winnetka Covenant Church and Pre-school, the Arlyn Day School, Marie Murphy School, and the Avoca School District #37 Office.
Hibbard Road is under the jurisdiction and maintenance of IDOT. Illinois Road is under the jurisdiction and maintenance of Cook County Department of Transportation and Highways.
Note: IDOT projects typically have three distinct phases. Phase I (or the project Study) consists of developing the project scope, environmental studies and preliminary design of a project. Phase II (Design) consists of refining the design to develop contract plans and land acquisition. Phase III (Construction) consists of the actual construction of the project.
Purpose and Need
The purpose of this improvement is to evaluate suitable traffic control alternatives that address the safety and operational concerns experienced at the intersection. The safety needs identified include reducing potential for crashes and injuries as well as maximizing safety for pedestrians and bicyclists.
In order to address the operational issues, improvements which increase driver awareness and expectations while reducing the potential for aggressive driving that could be the result of long queues and delays are necessary at this intersection.
IDOT evaluated four alternatives to address the identified safety and operational needs experienced at the intersection of Hibbard Road at Illinois Road. Alternative 1: Traffic Signal Installation, Alternative 2: Compact Roundabout, Alternative 3: Mini Roundabout, and Alternative 4: Low Cost Improvements.
Alternative 1: Traffic Signalized Installation
This alternative proposes to install traffic signals and widen the intersection to provide exclusive left turn lanes on all four legs of the intersection. This gives left turning vehicles their own signal time without the through movement conflict. Additional crosswalks and sidewalks and would be provided on each leg as well as pedestrian signals and push button countdown timers. The operations would improve with vehicular queues being reduced by 40%.
Tree pruning and removal is necessary to accommodate this improvement and would require land acquisition in the form of Fee Simple Acquisition and Temporary Easements from 6 parcels totaling a tenth of an acre. The cost for this improvement is estimated at $2,700,000.
Alternative 2: Compact Roundabout
Alternative 2, the compact roundabout, incorporates a landscaped center island and a truck apron providing additional space for large vehicle over tracking. The splitter islands provide a refuge area for pedestrians and increased deflection guidance and speed reduction for vehicles entering the circulating lanes. The center island landscaping allows for proper visibility to reinforce speed reduction of vehicles entering the circulating lanes.
This alternative would improve operations with vehicular queues being reduced by 49%. Tree pruning and removal is necessary to accommodate this improvement and would require land acquisition in the form of Fee Simple Acquisition and Temporary Easements from 6 parcels totaling a 5 hundredth of an acre. Due to its novel design to provide visibility during nighttime, intersection lighting would be included with the proposed improvement. The cost for the reconstruction of this improvement is estimated at $721,000.
Alternative 3: Mini Roundabout
Alternative 3, the mini roundabout, is a smaller modern roundabout with a fully traversable central island used commonly in low-speed urban residential areas with operating speeds under 30 mph.
Passenger cars enter the intersection making right turns into a circulating lane after they’ve yielded to circulating traffic avoiding encroaching on the center island. Larger vehicles such as school buses or large trucks enter the mini roundabout much like a passenger car; however, due to their larger size, their rear axles are allowed to go over the center island to make a left turn. Like the compact RAB, the splitter islands, though smaller, provide a refuge area for pedestrians.
This alternative would improve operations with vehicular queues being reduced by 49%. Tree pruning and removal is necessary to accommodate this improvement and would require only temporary construction easements from 4 parcels totaling 9 hundredths of an acre. Due to its novel design to provide visibility during nighttime, intersection lighting would be included with the proposed improvement. The cost for the reconstruction of this improvement is estimated at $640,000.
Alternative 4: Low Cost Improvements
Alternative 4, Low Cost Improvements is a general design option that involves no major construction within the project limits. This option maintains the existing shared left, though, right turn lanes on each leg. Due to the limited scope, no new sidewalks would be constructed and vehicles queues and delays at the intersection are not addressed.
However, to increase safety at the intersection of Hibbard Road and Illinois Road, IDOT proposes to prune and/or remove trees and bushes with its ROW to improve sight lines. This is expected to increase driver visibility of the intersection and its approaches before stopping, allowing the double stop signs, pedestrians, and bicyclist to become more apparent. Stop bars on the north of Hibbard Road and on the west leg of Illinois Road along with the crosswalk located on the west leg of Illinois Road exceed spacing requirements. Each would be to move each to improve sight lines at the intersection. IDOT would provide high visibility crosswalk pavement markings to the north and east legs of the intersection and provide ADA compliant sidewalk ramps on all four legs for connectivity.
IDOT also proposed to install a flashing red light in the center of the intersection to reinforce the existing stop control conditions. This improvement is expected to cost approximately $50,000.
A public meeting was held at the Marie Murphy School in Wilmette, Illinois, on Wednesday, April 15, 2015, to introduce the proposed concept plans. Below are the exhibits and presentation available at the meeting.
Comments are now being taken and must be received by May 15, 2015.
Proposed Alternative Plans and Exhibits:
Audio Visual Presentation
April 2015 Hibbard at Illinois Public Meeting Audio-visual Presentation.wmv
Hibbard at Illinois PowerPoint Final.pdf
Hibbard at Illinois PM Exhibits-Final.pdf
Alternative 1: Traffic Signal Installation
Alternative 1 Traffic Signalization Installation.pdf
Alternative 4: Low Cost Improvement
Alternative 4 Low Cost Improvements.pdf
Phase I Process (we are here)
As the Hibbard Road at Illinois Road project study progresses, IDOT will periodically update this website to assure that the motorist of Illinois are kept informed of project developments, public involvement opportunities, and construction related activities.
The Project Team is interested in hearing from you. If this site has not answered all of your questions, please contact us at:
Illinois Department of Transportation
Bureau of Programming, 4th Floor
201 West Center Court
Schaumburg, Illinois 60196
Attention: Mr. Carlos Feliciano
The Illinois Department of Transportation looks forward to your continued input and support.