In one embodiment there is provided a system for recalculating a formula previously used in preparing a mixture made from adding at least two components. A reverse link channel is allocated to be a shared acknowledgement channel for receiving acknowledgement information. The third plane joins, by means of an underlying u-shaped channel, a flange that projects outwardly for retaining the strip to a gutter. This invention integrates additional wireless technologies to assure that only authorized users trigger the traffic light changes that typically make it safer for emergency vehicles when they approach a traffic light.