Road markings and raised pavement markers are vital tools in ensuring efficient and safe traffic flow. Maintaining the visibility of both is an important task for those involved in road maintenance. Visibility in this sense, is characterised by the optical retroreflective properties of the markings.
To date these measurements have been performed mainly with handheld instruments. Despite the accuracy and ease-of-use of these devices, they are not an option for measuring long distances and for network analysis.
DELTA’s latest addition to their line reflectivity measurement range is the LTL-M, a unit that measures the reflectivity of road markings at normal traffic speeds. This ensures the safety of operators and roads do not have to be closed for measurements to be taken.
The LTL-M is a robust, reliable and advanced instrument developed specifically for network survey. It uses the latest camera and illumination technology resulting in high accuracy data collection which is independent of road geometry and vehicle tracking.
The LTL-M measures night time visibility (RL) of (both) white and yellow road markings under (both) dry and wet road conditions as well as measures the daylight contrast. The unit also records line geometry and missing or non-working road studs.
ARRB Group’s development team has successfully integrated the LTL-M unit into their Hawkeye platform. Data collected is processed and further analysed within the Hawkeye Processing Toolkit (HPT), allowing for data to be graphed and exported as shape files. The data can then be imported into third party GIS applications such as ArcMap.
The integrated line reflectivity data within HPT provides information that will assist road authorities to plan maintenance safely and efficiently.
ARRB’s Services group has installed an LTL-M and is undertaking a survey across 2000-4000kms of a state road network. For further information on the outcome of the survey, contact firstname.lastname@example.org.