TY - SER AU - Stainforth, Roger TI - Sign language KW - INTELLIGENT TRANSPORTATION SYSTEMS KW - REAL TIME INFORMATION KW - VARIABLE MESSAGE SIGNS N1 - This article describes the critical reasons for installing and running extensive variable message signs (VMS). A key consideration is that the signs convey information to all drivers in the system who pass by them, ensuring consistency of information and giving the system operator control over the information the road users are exposed to ER -