Does anyone have any experience of using rotating prism signs controlled by a Siespace instation. Our Traffic Management section plan to buy some and have asked us if we can control them. My initial thoughts are yes but we have no experience with them. At this stage there are 5 manufacturers being asked to tender for the signs - is there anything we should be aware of? My initial thoughts are UTMC compliant and GPRS comms to fit in with our other equipment.