3D LASER SCANNING AS A TOOL FOR MODERN ROAD DESIGN. A METHODOLOGY AND APPLICATIONS IN INTERSECTION SAFETY ANALYSIS

摘要

The emerging advances in vehicle technology lead to an increase in the fidelity with which theroad environment needs to be known to the driver and the vehicle itself. The importance of trueand precise road geometry becomes very important in this context and the requirements foraccurate 3D road design become so demanding that conventional 2D approaches are ofteninsufficient. The aim of this paper is to present a practical example of implementing terrestriallaser scanning and imaging total station as part of topographical survey for road design and roadsafety analysis. Two different types of advanced surveying instruments are used and theapplication includes two types of road intersections (urban and suburban). All data for thisproject were newly generated. Specifically, no drawings as-built (original construction) existedfor the selected road intersections, and no data sets (digital or hard copy) were used asreferences or as enhancements to the data produced. The methodology is demonstrated for theestimation of sight distances directly from the created 3D models. The methodology presentedin this paper can be readily applied by practitioners and can have tangible benefits for roadsafety and the reduction of accidents, fatalities and injuries. 3D laser scanning is a powerful toolthat can have many other applications in highway engineering and design. The ability toconstruct a highly detailed model of the infrastructure at its actual current state is valuable as itcan be used to monitor its condition over time and space. Proactive and reactive maintenancecan thus be optimally planned and implemented, minimizing cost and maximizing effectivenessof resources spent.