Mobile variable message signs are designed for temporary traffic redirect during road repair, in case of sharp weather changes (fog, rain, snowfall, ice), when clearing wrecks after an accident, for facilitating traffic and road detours after large sporting events, in event of disaster (fire, explosion, natural disasters), etc. With its improved brightness and contrast, a mobile variable message sign attracts drivers' attention more effectively than conventional traffic signs; hence, it is more efficient in situations when fixed sign messages need to be disregarded by road users.

Mobile variable message signs are especially needed by road maintenance services and police to control traffic in emergency situations to ensure more effective level of service.