The invention relates to a persistent phosphorescent ceramic composite material which is a sintered dense body comprising two or more phases, a first phase consisting of at least one metal oxide and a second phase consisting of a metal oxide containing at least one activating element in a reduced oxidation state. Each fleet vehicle has an assigned time slot to transmit its reporting information over a communications network without interfering with transmissions from other vehicles in their own respective time slots. The polymer coating formulation includes a novolac epoxy resin, a bisphenol-Aepichlorhydrin epoxy resin, a photoacid generator, an adhesion promoter, and a mixture of acetophenone, cyclohexanone and butyrolactone organic solvents.