I-80 over Donner Pass is a harsh place in winter, with up to 35 feet of wet snow that comes in intense storms that can totally obscure vision. In places, the highway borders thousand-foot drop-offs and traverses ice-covered bridges. Yet, Caltrans must keep the Pass open, for I-80 is vital to commerce in the Northern California region. This page presents a joint effort by Caltrans and AHMCT to develop and deploy a safer and more efficient way to keep […]
Projects under safety
We aimed at the development of a system which can place Raised Pavement Markers (RPMs) in a more efficient cost-effective manner. AHMCT has focused on utilizing relatively inexpensive hardware, keeping the system as simple as possible in order to keep machine costs as low as possible, and making operations safer. AHMCT demonstrated a laboratory-based conceptual system that can install RPMs while maintaining continuous motion of the vehicle.
Some mountain pass roads are closed over the winter, and buried deep in snow by the spring–opening these passes is a difficult and dangerous job. There are few indicators to help find the road, and over time some of these indicators may no longer be available. The current research will develop a system to provide the operator with a visual display that will help them find the road, and safely and efficiently open the pass to the traveling public. […]
AHMCT researchers have developed a deployable prototype system for bridge profile sensing from a vehicle at highway speed, i.e. with no fixed or rolling closure. The system uses a scanning laser to measure range and reflected power from the bridge and the roadway. The laser data is analyzed by custom software to determine bridge height measurements, as well as lane widths and other horizontal dimensions. The software includes a user interface […]
AHMCT researchers have developed a coordinated set of standards and specifications for the use of laser scanning in Caltrans. Guidelines clarify the common limitations of 3D laser scanners and recommend mitigation methods, and will help engineers and surveyors to select the right scanner and determine optimum scanning settings for survey applications.
The Longitudinal Crack Sealing Machine (LCSM) program is dedicated to the development of automated sealing machines for relatively continuous longitudinal cracks, such as those that occur between a concrete lane and asphalt shoulders. The machine pictured here is the second generation Longitudinal Crack Sealing Machine (LCSM2) operated by Caltrans Maintenance crews in the Fresno area. […]
The AHMCT Cone Machine is a safe and efficient method of placing and retrieving highway cones during roadway lane closures. Most highway maintenance and construction operations require a means of separating the work zone from lanes of traffic, and traffic cones are one of the most common items used to delineate these work areas. However, present methods of deploying traffic cones require considerable manual effort and expose workers […]
Pavement Crack Sealing Crack Sealing History Longitudinal Crack Sealing Longitudinal Crack Sealing Status Longitudinal Crack Sealing Deployment Report Transfer Tank Longitudinal Sealing System Random Crack Sealing Mobile Router Robot
Fully Automated Sealing Effort Crack filling and sealing is necessary to ensure roadway structural integrity and extend the time between major rehabilitation. Conventional crack sealing operations exposes workers to traffic and can be tedious. A typical sealing operation involves a large crew sealing 1.5 to 3 km per day, while the crew is exposed to […]