The video cameras provide the fastest and simplest way of learning about traffic and weather conditions on the road. The method of transmitting the image captured by road cameras is dependant upon the available communications means and the purpose of a system.
An expanded fibre-optic infrastructure enables the transmission of images in real time, which is used in advanced road telematics systems. The lack of fibre-optic infrastructure efficiently reduces the visual control systems to the transmission of still images in jpg format with use of dedicated radio or GSM cellular networks.
As far as the purpose is concerned, visual control points are equipped with:
weather cameras intended to observe the surface state, located at places excessively exposed to black ice and other weather risks;
cameras intended to observe road traffic, located mostly in neighbourhoods with intersections and junctions;
cameras intended to observe road infrastructure objects as toll plazas or rest areas.
Visual control points installed along the road network are fitted with sensitive high resolution cameras that operate day & night, installed where the street lights’ beam of light reaches, or if not, equipped with infrared lights.