1. KENT COUNTY Safety Edge Projects
Lessons Learned

2. Vehicle leaves roadway on to the right shoulder, then over corrects, crosses centerline sticking oncoming vehicle head on.

3. Shoulder condition?

4. Maintenance Issues Low Shoulders require maintenance dollars
Kent County’s shoulder repair costs for 2011 where $450,000.
Over $160,000 in new gravel.
Equipment and Labor
Involves constantly working in traffic

5. Pavement & Shoulder Maintenance
Damage to outside edge of pavement
7 shoulder repair units

6. Bailey Drive –between Vergennes St and Boynton Avenue (2.65 Miles)
3 Different Projects
Bailey Drive –between Vergennes St and Boynton Avenue (2.65 Miles)
Ada Drive –between Fox Hollow Dr and Thornapple River Dr (1.31 Miles)
18 Mile Road– Casnovia to Peach Ridge Ave (1.5 Miles)

7. Bailey – Narrow shoulder and horizontal curves
Selection Criteria
Bailey – Narrow shoulder and horizontal curves
Ada Dr. – Narrow shoulder for higher volume
18 Mile – Narrow shoulder

8. Safety Edge

9. 30 to 40 degree

10. Three methods Crush and shape and 2 Course Resurface
Placed Safety Edge on both courses
Single Course overlay
Trenched existing shoulders to place safety edge
Crush & Shape and 2 Course Resurface
Placed Safety Edge during Top Course

11. Items to Consider
Cost to Place (including trenching)
Asphalt Valley Gutter Areas
Gravel loss at edge (incline)
Trapping Water on Shoulder
Compaction

12. COST
Additional HMA 30 Additional Tons per Mile/Side (3.5 inch Depth) 1 Mile Both $55/ton = $3,300 Trenching Existing Shoulder Estimated Cost = $1,000 per mile

13. Gravel loss one year later ½ to 1.5”

14. TRAPPING WATER

15. COMPACTION

16. Less concern of Edge Drop May reduce edge cracking
ANTICIPATED BENEFITS
Accident Reduction
Less concern of Edge Drop
May reduce edge cracking
Reduced maintenance costs