423Ground-In Rumble Strips

423.01 Description. This work consists of grinding rumble strips at the locations

indicated on the plan, in accordance with the details on the plans, and the requirements set out herein.

423.02 Blank.

423.03 Construction Requirements.

423.03.1 Equipment. The equipment shall consist of a rotary type cutting head capable

of cutting rumble strips to the dimensions shown on the plans. The cutting head shall have the cutting tips arranged in such pattern as to provide a relatively smooth cut of approximately 1/8 of an inch between peaks and valleys. The cutting head(s) shall be on its own independent suspension from that of the power unit to allow the tool to self-align with the slope of the shoulder and/or any irregularities in the shoulder surface. The finished rumble strips shall be cut to the dimensions as shown on the plans within the allowable tolerance and be perpendicular to th e direction of travel. The rumble strips shall be placed in relation to the roadway according to the patterns shown on the plans. Adequate back-up equipment such as mechani cal sweeper/vacuum, water truck, etc. and personnel shall be provided to remove all grindings from the shoulder.

423.03.2 Construction Details. The cutting tool shall be equipped with guides to

provide a consistent alignment of each cut in relation to the edge line and to provide uniformity and consistency throughout the project. The alignment of the cuts shall not deviate from the path of the edge line. When the contract requires shoulder paving, the rumble strips shall be cut into the finished shoulder after the final course has been placed, otherwise, rumble strips shall be cut into the existing shoulder material. The debris/grindings generated from the cutting shall be picked up and removed on a daily ba sis by use of a sweeper/vacuum or other method approved by the Engineer. The shoulder shall be cleaned prior to opening the adjacent lane to traffic. Any other method of cleaning debris from the shoulder or roadway other than picking up shall be approved by the Engineer prior to beginning construction. The use of the material from the rumble strips as RAP in the composition of asphalt mixtures shall require approval by the State Materials Engineer. The Contractor shall demonstrate to the Engineer the ability to achieve the desired surface inside each depression without tearing or snagging the asphalt prior to beginning the work. Areas damaged by the Contractor's operations shall be corrected and/or repaired as directed by the Engineer at no additional cost to the State. When placed on concrete shoulders, the Contractor shall adjust the spacing of the rumble strips to ensure that the depressions are not cut across a concrete shoulder joint. This construction operation will encroach on the lane adjacent to the shoulder receiving the rumble strips. Therefore, construction on roadways under traffic will either require a lane closure or be considered as a moving operation. Traffic control shall be handled in accordance with the appropriate standard drawings shown in the plans or contract documents.

423.04 Method of Measurement. Rumble strips, ground-in, completed in accordance

with the plans and specifications, will be measured by the mile, which price shall be full compensation for all materials, equipment, tools, disposal of grinding debris, any associated traffic control, and all incidentals necessary to complete the work. Length of measurement will start at the beginning of a continuous series of rumble strips and will terminate at the end of the continuous series. The length used to measure rumble strips will be the horizontal length computed along the stationed control line. Each shoulder on which rumble strips have been ground will be measured separately with the measurements from each shoulder combined to obtain the pay length for rumble strips.

423.05 Basis of Payment. Rumble strips, measured as prescribed above, will be paid

for at the contract unit price per mile, which price shall be full compensation for completing the work. The price for rumble strips sh all include the cost of any required maintenance of traffic and protective services. Payment will be made under: 423-A: Rumble Strips, Ground-In - per mile 423-B: Rumble Strips, Ground-In, Concrete - per mile