Decumanus MaximusDecumanus Maximus
is a term in ancient Roman city planning. It denotes a E-W oriented road in a Roman military camp or colonia
. The main decumanus is the Decumanus Maximus that normally connects the Porta Pretoria (in a military camp, closest to the enemy) to the Porta Decumana (away from the enemy). In the middle the Decumanus Maximus crosses the perpendicular Cardus Maximus
, the other main road. The Forum
is normally located at this intersection of the Decumanus Maximus and the Cardus Maximus.
The term 'decumanus' is derived from the E-W line the augurs would draw when making the auspices.