The choice of camera and tube depended upon the consideration of criteria such as the dynamic range, linearity, uniformity of response, resolution, flare, persistence, spectral response and number of blemishes. A method of asessing the resolution of a television camera system which gave the modulation transter function (MTF) directly on an oscilloscope is described. The camera employed in this particular application was of the low light level type, the pictures being recorded on a video tape recorder (VTR) whose characteristics also had to be considered. A calibration grey scale was included in the picture by means of a split viewing arrangement. The fundamental feature of the video analysis system for deriving the luminance values was an analogue processor which gave the average video signal level over any selected area of the television picture. The accuracy of the system has been assessed for road luminance values measured from a mobile laboratory by comparing them with independent measurements using a Pritchard photometer.