005- Roman Period
Like most Roman cities, Jerash has a north-south primary street called cardo, and east-west intersecting streets called decumani. The streets are paved with the original stones, grooved by chariot wheels. They are lined by Ionic columns from the 1st century CE, except for the lower cardo that was widened and upgraded to Corinthian columns around the 2nd century CE. The columns get gradually shorter on upslopes to maintain the level of the connecting beams (architraves). These beams eventually connect to the side of a tall column to start a new higher section. Tall columns also mark important points such as the entrance to the food market (macellum). A complex drainage system runs under the full length of the cardo.
The cardo runs between the south and north gates. It is intersected by two east-west streets: the south decumanus and north decumanus.