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Maintaining Access on Concrete Overlay Projects


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A presentation given during the 39th Annual NCPA Concrete Paving Workshop. By Dale Harrington, P.E., CP Tech Center

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Maintaining Access on Concrete Overlay Projects

  1. 1. Maintaining Access on Concrete Overlay Projects 1 39th Annual Concrete Paving Workshop, Lincoln, Nebraska January 16, 2018 Dale S. Harrington P.E. -Representing the CP Tech Center
  2. 2. Traffic Management for concrete overlay projects are no more challenging than for any other paving project, particularly under traffic, with proper planning for ingress and egress of adjacent property owners as long as straightforward practices are followed: Traffic Management/ Access To Adjacent Properties - Concrete Overlays-
  3. 3. Roadways Closed or Open to Traffic During Construction -Local Access to Properties- Who are affected?- Everyone – Businesses and Farmers – Homeowners – Pedestrians – Schools and Churches – Fire and Police Protection – Utilities – Special Events, etc. 3
  4. 4. Concrete Overlays (Closed or Not Closed to Traffic) • Always analyze the option of closing road where feasible. • Concrete overlays can be successfully and cost-effectively constructed without closing the roadway to traffic • A common misperception is that concrete overlay construction on two- lane roadways requires road closures • Concrete overlays may be constructed on four-lane divided roadways without crossovers and head-to-head traffic or on 2 or 3 lane roadways
  5. 5. 2 Lane Roadways-Too close or not Close for Overlay Construction  Partly or completely closing a work zone to traffic can help minimize traffic management costs.  Projects closed to traffic can save time and cost of 25% to 35%.  The contract documents should clearly state that the contractor is responsible for maintaining local access for residents and businesses.  Allow the contractor the flexibility in their methods for providing local access is a preferred strategy
  6. 6. 2 Lane Roadways-Too close or not Close for Overlay Construction Example of costs savings with closed overlay project. • Midwest State Highway Overlay Project 2012. • 4.5” Thick Concrete and Asphalt on 2 lane project • Each project 8.5 miles long, same highway • Constructed same year; paving costs very equal – Asphalt Overlay constructed under traffic: $3,410,000 – Concrete Overlay Closed to Traffic: $2,521,000 Savings: $ 889,000 35% savings was mainly in traffic control operations
  7. 7. IA 175 Two Lane Paving With Detour • This road had wide, stable shoulders and could have been done under traffic in the Odebolt area. • It was determined to close the road to traffic and pave two lanes at a time due to lower traffic
  8. 8. US 65 Single Lane Paving With Detour Project set up to be built two lane with detour, but the contractor chose one lane with detour to learn about the smoothness with stringless paving.
  9. 9. Communication 1. Preconstruction conference (agencies/contractor) 2. Preconstruction conference (owner/contractor/nearby residents) 3. Biweekly construction team meetings 4. Prepaving team meeting 5. Regular discussion with Landowners 6. Weekly Notice in Newspapers 7. Website Access
  10. 10. • “All reasonable mitigation measures should be assessed in an effort to keep the delay below the threshold limits” • This can amount up to 25% of the projects cost • Minimizing disruption to traffic in work zones • Involving officials and the public during early stages of project planning • Broadly publicizing the work zone well before construction Traffic Flow - Concrete Overlays
  11. 11. Traffic Flows Key Thresholds • Level of Service – must be D or better – Significant reduction in speed • Volume to Capacity Ratio – greater than 0.80 – Impacts on Capacity • Close work activity • Narrow Lanes • Number of Lanes • Travel Time Delay – less than 10 minutes – Speed reduction and length of construction zone
  12. 12. • Traffic strategies in work zones can significantly affect project costs • Traffic control costs and construction costs should be balanced against the impact on the public • Many urban intersections have been overlaid with concrete utilizing only weekend work hours • Partly or completely closing a work zone to traffic can help minimize traffic management costs Traffic Management Cost Effectiveness
  13. 13. Two Lane Paving vs. Single Lane Paving • Traffic – 3000-5000 vpd consider single lane paving and open to traffic – Less than 3000 vpd may not be feasible to keep open – More than 5000 vpd may be four lane and can stage traffic accordingly • Existing Section (shoulders) – Wide enough and stable for traffic?
  14. 14. Preconstruction Communications Contractor Representatives Meeting with Landowners Preconstruction Public Hearing with Contractor
  15. 15. Communications • Make sure agency provides the contractor with a map showing the names, phone numbers and email addresses of the adjacent landowners. • Make sure the landowners as got the contractors name and phone number • Contractor needs to provide access availability to the landowners whether the roadway is open or close to through traffic during construction. • Well and the contractor must communicate regarding the project staging so they know what to expect. 15
  16. 16. Overlay for Two Lane Roadway with Paved Shoulders (Conventional Paver)
  17. 17. Work Zones Under Traffic Maintenance and Protection of Traffic • A well thought out traffic control plan is essential. • Where possible, establish detours to accommodate intersections. • Temporarily shutting off intersections for paving allowed for smooth and efficient concrete placement. • Proper staging of operations allowed the contractor to complete phases more efficiently.
  18. 18. Overlay for Four Lane Roadway with Paved Shoulders (Conventional Paver) 4’ 4’
  19. 19. Traffic Shift from Tied Bars
  20. 20. Advisory Sign Recommendations • Consider advisory sign “Road Const. Next ____ Miles, Expect Traffic Delays” ̶ Advisory signs help warn public ahead of time and some will use alternate routes. Generally public is more acceptable when advanced warning is given
  21. 21. Concrete Overlay Constructed Under Traffic • When a roadway cannot be closed, higher costs are probably justifiable. • Possible ways to manage costs include: – Where possible, reducing traffic volume through work zones – Reducing the frequency and duration of work zones ( typically no more than 3 miles).
  22. 22. Two-Lane Highway Under Traffic • Typically traffic control zones are kept to 0.25 mile (0.4 km) in length without the use of a pilot car. • In rural areas it is more feasible to pave longer sections, so a pilot car and flaggers are often used. (2.5 to 3.5 miles) • Other traffic control measures including flaggers and traffic control signals may be warranted according to jurisdictional requirements
  23. 23. Pilot Car Impact * Thru traffic reduced 10% with pilot car introduction •6-8 vehicle queue with 2 mi. work zone (for misc work) •15+ vehicle queue with 3.5 mi. work zone (for paving) •Pilot car speed = 35 mph
  24. 24. Stage Work to Meet Both Public & Construction Goals • Any intermediate time limits should be spelled out in the plan • The actual construction schedule should come from the contractor, follow the general 4 stage plan, and be approved by the highway agency • As a rule of thumb, consider 5 working days per mile of overlay. US 18 could have been completed in less than 120 days • Transverse joints were spaced 25 feet apart and leapfrogged down the pavement
  25. 25. Create an Efficient Construction Project • Allow & encourage multiple work zones for each construction activity • Shoulder & mark as maturity is reached • Use the pilot car 24/7 to eliminate centerline wedge construction • Encourage bridge transition & approach construction by mainline paving equipment • Close only cross roads in paving area & only one paved cross road per 5 miles of construction area
  26. 26. • With the use of two or more work areas, the paving crew can pave for 5-6 days of every week. • This allows for good use of equipment, manpower and demonstrates to public the will to accelerate the work. US 18 Paving Schedule-Under Traffic
  27. 27. Approaches • Do not remove perfectly good intersection PCC approaches with full depth pavement when inlay would work. If grades of mainline are slightly higher then the existing pavement then the inlay is the right option. • At V-68, the turning lane was widened and grade maintained. The mainline was inlaid by coring out existing asphalt. • A majority of the pavement on V- 68 was maintained
  28. 28. Thank You National Concrete Pavement Technology Center