1 / 11

LOW COST SAFETY IMPROVEMENTS

LOW COST SAFETY IMPROVEMENTS. Practitioner Workshop Exercise C – Session #9. Traffic Signals – Exercise XII: Naper Blvd and Plank Rd. Learning Outcomes: Analyze traffic crash crash and other engineering information Select appropriate low cost safety and engineering Countermeasures.

lotta
Download Presentation

LOW COST SAFETY IMPROVEMENTS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. LOW COST SAFETY IMPROVEMENTS Practitioner Workshop Exercise C– Session #9

  2. Traffic Signals – Exercise XII: Naper Blvd and Plank Rd Learning Outcomes: • Analyze traffic crash crash and other engineering information • Select appropriate low cost safety and engineering Countermeasures

  3. Traffic Signals – Exercise XII: Naper Blvd and Plank Rd Remedy of Naper Blvd & Plank Road Traffic Signal Northbound Naper Blvd at Plank Road

  4. Traffic Signals – Exercise XII: Naper Blvd and Plank Rd Remedy of Naper Blvd & Plank Road Traffic Signal Southbound Naper Blvd approaching Plank Road At 280 feet back from Stop Bar

  5. Traffic Signals – Exercise XII: Naper Blvd and Plank Rd Remedy of Naper Blvd & Plank Road Traffic Signal MUTCD Requires 460 feet of visibility Southbound Naper Blvd approaching Plank Road At 450 feet back

  6. Traffic Signals – Exercise XII: Naper Blvd and Plank Rd Remedy of Naper Blvd & Plank Road Traffic Signal Southbound Naper Blvd at Ogden Av toward Plank Road

  7. Traffic Signals – Exercise XII: Naper Blvd and Plank Rd Remedy of Naper Blvd & Plank Road Traffic Signal • The intersection of Naper Blvd with Plank Road was improved to traffic signal control in 1985 with the construction of Naper Blvd, a new 4 lane major arterial connecting south portions of Naperville, IL to the Illinois Tollway interchange to the north. • Plank Road is collector street with 5,500 ADT • Traffic crash experience averaged 15 per year with 6 to 8 serious injury crashes for the years 1985 thru 1991 • Traffic volumes on Naper Blvd started at 12,000 ADT in 1985 and grew to 28,000 ADT by 1991

  8. Traffic Signals – Exercise XII: Naper Blvd and Plank Rd • Speed limit on Naper Blvd is 40 mph; 85th percentile speeds are 48 mph; speed limit on Plank Road is 35 mph. • Traffic signals were added to the north of this signal and a closed loop signal system was installed in late 1991. • Traffic volumes on Naper Blvd started at 12,000 ADT in 1985 and grew to 28,000 ADT by 1991. • Traffic crash experience averaged 15 per year with 6 to 8 serious injury crashes for the years 1985 thru 1991 • In early 1992, a multi-vehicle crash with fatalities was followed by two fatal crashes; 1993 had 4 fatalities, 9 serious injury crashes out of a total of 28

  9. Traffic Signals – Exercise XII: Naper Blvd and Plank Rd • Visibility of the signals was a significant issue; southbound traffic could not see the far side indications until a point 280 feet from the stop bar; visibility of the northbound signals was slightly better at 350 feet. • Review of the engineering plans identified that the signal design was for tangent approaches; the actual conditions in the field were a reverse 35 mph 6 degree curve. • Signal heads were far side only with 12” sections and backplates • Review of Clearance Intervals (Yellow and Red) was carried out for 45 mph approach speeds and found to be consistent with ITE practice.

  10. Traffic Signals – Exercise XII: Naper Blvd and Plank Road • What low cost safety countermeasures would you consider? • What is the safety effect (CRF) for each? Discussion

  11. Exercise Questions?

More Related