A method of erecting a new elevated roadway above an existing roadway in order to increase traffic capacity of bridge roadway with minimal disruption of existing traffic. In addition, fluorescence can be detected and localized within a subject by such application of radiation through an optical fiber. A testing controlled scenario is provided for allowing to measure the values of the two quality metrics separately, detecting the presence of the maximum value measured for concurrent workload of the node under test in the measurement of the accuracy of said node in carrier sensing. The respective samples have different, known proportions of short-chain branching.