Project Summary
Transmap Corporation was contracted to conduct a pavement condition assessment of all the paved streets maintained by the City of Burien as part of the 2021–2022 Pavement Management Program.
Transmap specializes in mobile data collection. Their vehicles are equipped with Laser Crack Measurement Systems (LCMS, LCMS2) that use laser line projectors, high speed cameras, and advanced optics to produce 100 percent continuous coverage crack imagery and high-resolution 3D profiles of roads.
Data is collected at posted roadway speeds without the need for traffic control or impacts to local traffic.
Transmap assessed the condition of all paved roadways in the City’s street network (approximately 1,440 segments and 138 centerline of roadway) using a digital image database captured during raw data collection in the field. Transmap rated both the type of distress (alligator cracking, edge cracking, potholes, etc.), as well as the severity of each distress, following the guidelines established by ASTM D6433 standards.
Pavement distress with alligator cracking. Credit: City of Burien.
Sidewalk Survey
In addition to the Pavement Condition Assessment, Transmap also used their dual panoramic cameras and high-definition Light Detection and Ranging (LiDAR) technology to survey approximately 62 miles of sidewalks. This data was used to update the City’s asset management inventory.
Project Background
The City is responsible for repairs and maintenance of approximately 138 centerline miles of paved roads (residential roads make up 78% of the total, collector roads make up 13%, and arterial roads constitute 9%).
Pavement condition data is a critical component of any pavement management program. The various types of distresses (cracks) identified within the pavement are indicators as to the type of maintenance the City will need to conduct immediately and in the future.
Each segment of road within Burien is given a rating on a scale of 0 to 100 called pavement condition index (PCI). A newly constructed street would have a PCI of 100, while a failed street (requiring complete reconstruction) would have a PCI under 25.
In 2014, the City’s streets condition survey resulted in a calculated average PCI of 74, placing the City’s street network in the “good” condition category.
Pavement condition data is incorporated into the City’s StreetSaver® Pavement Management Program. StreetSaver® provides a set of pavement management analysis tools that help determine maintenance and budget needs and project selection. The City uses maintenance prediction models to assist in planning their five-year Pavement Management Program.
Project Timeline
Data collection, reports, and services were completed by April 2022.
Updated May 1, 2022