Construction Projects Weekly 411
Brown Street Traffic Signal Conversion to ALL-Way Stop - 2020
Following the conclusion of a warrant study for an existing traffic signal at the intersection of Brown Street and West Washington Street, the City Council authorized the removal of the signal and converting the interstation to ALL-WAY stop control.
Wilburn Engineering conducted an intersection investigation and traffic warrant study for the above-referenced intersection.
In accordance with the Manual on Uniform Traffic Control Devices (MUTCD), prior to the installation of a traffic signal, a study is required to determine warrants. There are generally 9 warrants considered.
At this time, the equipment in use at this intersection is sub-standard, difficult, and expensive to maintain. Before considering upgrades to the equipment, the warrant study was commissioned to determine whether or not a signal is appropriate. A study could show that stop sign control is more appropriate in providing a safer, more efficient movement of traffic through this intersection.
From the investigation, in accordance with ALL-WAY stop control, it is necessary to make improvements to the existing streetscape to accommodate STOP signs. This work includes new curbs/curb extensions with a decorative brick pattern, planting areas, and ADA compliant accessible curb ramps.
Also in accordance with the MUTCD, the existing signal will be put into all-red flash mode for a minimum of 90 days to allow drivers to get accustomed to stopping at each approach, before removing the signal.
Conversion to ALL-WAY stops will have no impact on the lever of service for the intersection.
This project is funded from SPLOST 2019.
Pavement Assessment - 2020
The City of Newnan recently completed a comprehensive assessment of the condition of pavement for every street segment in the City. A segment is defined as a section of the street, from intersection to intersection.
Ideally, this is conducted every five years to determine the overall condition of our street network.
The assessment report is used in the selection of streets to be maintained, annually. The idea is to do the right maintenance to the right street at the right time. This does not necessarily mean the worst-rated streets receive maintenance first. If we can do the right maintenance at the right time, we can prolong the life of a street, thereby avoiding the need for major reconstruction.
The segments are rated from 0 to 100, with an overall target of 70 for the network as a whole. For 2020, our overall network score is 69.1, which is considered "good." The average currently seen across the U.S. is between a 60 and a 65 so Newnan falls above the averages when compared to other agencies.
In addition, an agency would like to see a Percent of Excellent (roads that score above a Pavement Condition Index of 85), at a minimum of 15% of the network. This is an indicator that an agency is reinvesting in the network somewhere close to their steady-state requirement (the monies needed to maintain existing conditions). Newnan is currently at 22%, well above the recommended minimum target of 15%.
Finally, the assessment addresses the backlog. Backlog represents the big-ticket work on the roadway network (full depth reconstruction, partial reconstruction, surface removals, etc.) The backlog is the Very Poor and Poor roads that fall below a Pavement Condition Index of 40. Generally, a very healthy agency will have less than 10% of its network in the backlog category with 12-15% representing a realistic target for most agencies. As soon as an agency approaches and/or exceeds a 20% backlog, the big-ticket work can spiral out of control as it piles up faster than capital can be pumped into the system. The Newnan network is currently 9%, which is manageable.
The report provides measures to determine budget needs for maintaining the current condition average for the network.
Utilizing the Network Value at $94M, Newnan would need to budget approximately $1.88M annually to maintain the current condition average for the roadway network.
Utilizing the Average Condition by Pavement Type, Newnan would need to budget $3.4M annually to maintain the current condition average for the roadway network.
Utilizing Total Deficit, the fix-all estimate is approximately $46M, and the life cycle cost is $2.65M annually to maintain the current condition average for the roadway network.
The City of Newnan has a network of approximately 176 miles.
Street Maintenance - 2020
With funding assistance from the Georgia Department of Transportation, maintenance work has begun on local streets in the City of Newnan. This work includes the variable depth milling, deep patch, and resurfacing of approximately 2.8 centerline miles on 11 streets, and the application of thermoplastic traffic strip and pavement markings.
C W Matthews has been awarded a contract for the work with a base bid amount of $902,089.82. The assistance from GDOT is $437,676.17.
The list of streets included:
- East Newnan Road, from East Broad Street to Martin Luther King, Jr. Drive, including the roundabout
- Greison Trail, from McIntosh Parkway to East Broad Street
- Gladecress Lane, from East Newnan Road to Preserve Drive
- Preserve Drive, cul-de-sac to East Broad Street
- Rockcress Court, from Preserve Drive to cul-de-sac
- Belltree Circle, from Lower Fayetteville Road to Westhill Drive
- Stones Throw Lane, from Stonebridge Way to Granite Way
- Fairhaven Drive, from Fourth Street to Fairview Drive
- Natalia Court, from Fairhaven Drive to cul-de-sac
- Fairview Drive, from Natalia Court to cul-de-sac
FDR is a reconstruction method that utilizes existing, in-place, materials, including asphalt, aggregate, and soil, to produce a structural base for the roadway. A new layer of asphalt is placed on the reclaimed base. The base bid amount for this work is $850,161.85.
Both of these projects are funded from SPLOST 2019.