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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.

his project has two parts. The first part involves performing a literature search and a user survey to develop an understanding of the state-of-the-art in roadside inventory for Caltrans use. The second part will identify best practices and develop a set of recommended practices for Caltrans that would capture experience learned from Phase 1 and take advantage of available technologies. As part of Phase 2, some experiments will also be made in […]

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 are developing a cost-effective mobile information system for snow fighter supervisors to provide in-vehicle access to critical information needed to make timely decisions. The system simultaneously increases supervisor situational awareness and enables them to stay in the field longer to assist and communicate with snow fighter crews. […]

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.

AHMCT researchers have developed an intelligent sensing system for detecting road-embedded magnetic reference systems. The system addresses drawbacks of previous research prototypes, and moves magnet-based vehicle guidance and control closer to real- world application. The patented system works for both discrete embedded magnets and continuous magnetic references, i.e. “tape,” and can be applied in highway maintenance, transit, commercial vehicle, loading, factory, and airport operations.

AHMCT researchers are developing a wireless network-based approach for delivering precision GPS differential correction signals to vehicles. This system enables novel applications requiring decimeter or centimeter-level accuracy, and removes the need for a dedicated RF license. It leverages emerging wireless standards and infrastructure. In addition, the significant remaining bandwidth can support many other 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. […]