A method of applying a NOx degrading composition on a concrete element, including providing a concrete element having a surface, and applying a composition including photocatalytic titanium dioxide particles dispersed in a continuous phase on the surface of said concrete element. The approach according to the present invention bases on using an angle-selective device operated by the principle of total internal reflection to reduce divergence of the incoming beam, in contrast to a spatially-selective device as for example a field-stop or slit. The biosensor may be attached to the body through the use of a garment which may be fastened in multiple locations on the human body. A method is provided that includes, at one of a first vehicle or a second vehicle, receiving an updated time of an event involving the first vehicle and the second vehicle in a transportation network.