cold patch, alternative, trench. road, utility, plates, securePlate Locks make cold patch road plate securing a thing of the past. Never have another sleepless night wondering if your road plates have shifted, moved or walked again. Reduce your liability while increasing public safety. No more phone calls from the city, county or police during the wee hours of the morning telling you to come fix a trench plate that has moved and is posing a risk. Read More.