Tarmac Ltd. commenced the manufacture of Tarmacadam from slag in 1903 and was the pioneer of the use of Slag Tarmacadam in connection with the repair and construction of roads etc. Since that date many millions of tons have been supplied by Tarmac Ltd. The eight wheel rigid has served the British haulage scene well.Many hauliers used them fitted with a bolster turntable plus an independent bogie and the combination made easy work of these 50' bridge beams. These Vinculum beams were made by Tarmac in the Viniculum Dept. who manufactured large quantities of building materials, road kerbs, channel, paving flags etc