456.1 General Description
This work includes constructing rumble strips on paved shoulders, edge lines, or centerlines by milling or grinding 1/2 in. (13 mm) deep depressions into the finished surface as shown in the plans.
456.1.01 Definitions
A. Patterns Skip ground in place rumble strips—Rumble strips placed with 30 ft. (9.0 m) of strips and 10 ft. (3.0 m) of clear space between. Continuous ground in place rumble strips—Rumble strips placed continuously. B. Placement Edge line rumble strips – Rumble strips placed continuously or in a skip pattern on the edge line traffic stripe. Centerline rumble stripes – Rumble strips placed continuously on the centerline traffic striping. Shoulder rumble strips – Rumble strips placed continuously or in a skip pattern on the inside and/or outside shoulder of the roadway.
456.1.02 Related References
A. Standard Specifications General Provisions 101 through 150. B. Referenced Documents General Provisions 101 through 150.
456.1.03 Submittals
General Provisions 101 through 150.
456.2 Materials
General Provisions 101 through 150.
456.2.01 Delivery, Storage, and Handling
General Provisions 101 through 150.
456.3 Construction Requirements
456.3.01 Personnel
General Provisions 101 through 150.
456.3.02 Equipment
A. Cutting Tool Use a cutting tool that meets these requirements: • Has independent suspension from the power unit to allow the tool to self-align with the slope of the shoulder • Is equipped with guides to provide consistent alignment of each line of indentations in relation to the roadway • Houses a single rotary-type milling/grinding head in line in the direction of travel • The cutting tips on the milling/grinding head are arranged to provide a smooth cut with no more than 0.05 in. (1 mm) between the peaks and valleys
456.3.03 Preparation
General Provisions 101 through 150.
456.3.04 Fabrication
General Provisions 101 through 150.
456.3.05 Construction
A. Indentations Form the rumble strip indentations as follows: 1. Placement of indentations must be completed within ten calendar days of opening traffic in final lane configuration. 2. Ensure the finished indentations conform to the following: a. Indentations have a concave circular shape and are spaced 12 in. (300 mm) center to center. b. Shoulder and centerline rumble strips indentation dimensions: • 7 in. (175 mm) wide with a 5 in. (125 mm) gap in the direction of travel • 16 in. (400 mm) long when measured perpendicular to the direction of travel. • Minimum 1/2 in. (13 mm) maximum 5/8 in. (16 mm) deep at center. c. Edge line rumble strip indentation dimension: • 7 in. (175 mm) wide with a 5 in. (125 mm) gap in the direction of travel • 6 in. (150 mm) long when measured perpendicular to the direction of travel. • Minimum 1/2 in. (13 mm) maximum 5/8 in. (16 mm) deep at center. Excess waste material resulting from the operation may be swept to the grassed shoulder and spread where applicable. If an adjacent grassed shoulder is not available, or if directed by the Engineer, remove and dispose of the waste material in a manner approved by the Engineer.
456.3.06 Quality Acceptance
General Provisions 101 through 150.
456.3.07 Contractor Warranty and Maintenance
General Provisions 101 through 150.
456.4 Measurement
Indentation rumble strips are measured by the gross linear mile (kilometer). The plan quantity is the pay quantity unless the Engineer makes authorized changes. No deductions will be made for intersections, ramps, bridges, or skips.
456.4.01 Limits
General Provisions 101 through 150.
456.5 Payment
Payment will be made at the Contract Unit Price bid per gross linear mile (kilometer). Payment is full compensation for furnishing equipment and labor and for satisfactorily performing the work. Payment will be made under: Item No. 456 Indentation rumble strips—ground in place (continuous) Per gross linear mile (kilometer) Item No. 456 Indentation rumble strips—ground in place (skip) Per gross linear mile (kilometer) Item No. 456 Indentation edge line rumble strips—ground in place Per gross linear mile (kilometer) Item No. 456 Indentation edge line rumble strips—ground in place (skip) Per gross linear mile (kilometer) Item No. 456 Indentation centerline rumble strips—ground in place (continuous) Per gross linear mile (kilometer)
456.5.01 Adjustments
General Provisions 101 through 150
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