Advances in variable message signs.

Author(s)
Lewis, M. & Roe, I.
Year
Abstract

VMS (Variable Message Sign) technologies currently available are reviewed and the advantages of EEV's new sunlight readable LCD system discussed. EEV's VMS boards utilise fibre optic technology to rear illuminate an array of switchable LCD elements. A high level of contrast and luminance is achieved which can be read at distances in excess of 200m. Lamp brightness is continually monitored and adjusted. A light reflecting element operates in bright sunlight and the board can be read over a 12 degree cone of view. In the event of a failure all pixels darken. The automatic fault detection system is described. It is suggested that maintenance of EEV's LCD is easier than with other types of board. Details are given of the sign configurations available.

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Publication

Library number
C 20741 (In: C 20695) /73 /85 / IRRD 866074
Source

In: Traffic technology international '94, p. 212-214

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This publication is one of our other publications, and part of our extensive collection of road safety literature, that also includes the SWOV publications.