Variable Massages Signs (VMS) by Microprocessador Sistemas Digitais, SA Portugal give travellers information about special events. Such signs warn of traffic congestion, accidents, incidents, weather and road conditions information, roadwork zones or speed limits on a specific highway segment. They may also ask vehicles to take alternative routes, limit travel speed, warn of duration and location of the incidents or just inform of the traffic conditions.It is electronic and intelligent display panels for road traffic management. They allow text and graphic variable messages to be combined, resulting in a more effective means of controlling traffic at Road Infrastructure like express highways, toll, and tunnel & bridges. Intelligence comes in the form of a self-diagnosis tool, web server, TCP/IP and SNMP integrated protocol, several remote and local interfaces for control and maintenance and configuration, message store capacity, standalone or network configuration and control, digital and analogue input/output, direct interactivity with other road equipment, easy to adapt to new protocols, integrations and algorithms. The main controller, communication and power supply units are mounted in a roadside cabinet, meaning easy and safe maintenance. Quality is not an option, it is a must, following the European standards, including EN 12966 compliance.VMS are available as fixed VMS as well as portable – trailer mounted ones. Portable Variable Message Signs (PVMS) by Data Signs Pty Ltd, Australia can be used to make a real difference in road utilisation through on-the-spot driver education & coordination and in lowering the road toll. The PVMS is solar-powered and uses an on-board 12 V maintenance-free battery array for night use. It can be deployed quickly and easily which is particularly useful where drivers need to be advised to take alternate actions such as following a detour. It is also used to alert the drivers about upcoming/current events such as lane closures or an accident ahead. The wide-angle and low-power LEDs on these electronic signs provide greater visibility even as vehicles travel towards and past the message display. In India, Data Signs & Microprocessador is represented by Masstrans Systems.