Development of a Decision Matrix and Specifications for Portable Temporary Rumble Strips

Abstract

The objective of this thesis was to develop specifications for portable, reusable temporary rumble strips for their applications in different work zone settings in Kansas. A detailed literature review and a closed-course test was performed regarding temporary rumble strips. Additionally, data from permanent cast-in-place (CIP) rumble strips at six locations in Kansas were collected. All commercially available portable, reusable temporary rumble strips were tested in a closed-course setting using a standard dump truck and a full size car. The rumble strips’ rotational movement, linear movement, sound and vibration produced by a traversing vehicle were chosen as parameters in developing the decision matrix. Measurements of the strips’ linear and angular movements, sound, and vibration generated due to the test vehicles passing over the rumble strips were collected for a total of 40 passes each at speeds of 22.5, 37.5, 57.5 and 67.5mph. A matrix and a classification table were created with class intervals defining the classes based on the performance of temporary rumble strips at each of the speeds. Threshold limits for movement, rotation, and sound generation of the temporary rumble strips at each of the speeds were calculated for developing classification tables. Annual Average Daily Traffic (AADT) and Average Daily Truck Traffic (ADTT) were used in calculating threshold limits for movement and rotation. Sound threshold limits were based on CIP strips’ sound data. Following the results of the closed course test and an additional vibration test conducted at the University of Kansas, vibration was not included as a parameter in the final decision matrix. Unlike other parameters such as movement, rotation, and sound generation the vibration generated by the rumble strips were found not to be statistically different at different test speeds. A decision matrix consisting of parameters – movement (lateral and longitudinal), rotation, and sound – was developed. This matrix consisted of all the classes, including various work zone conditions ranging from low-speed, low-volume to high-speed, high-volume work zone conditions. This matrix in combination with the classification table provides a basis for a recommended method for any vendor or a research team with information regarding the performance of a temporary rumble strip, the type of class it belongs to and its applicability in various work zone conditions.