The Dual Roundabout or “Dog bone” interchange concept includes a new bridge constructed on new alignment for Calks Ferry Road parallel with the existing Calks Ferry Road overpass, which will be ultimately removed. New roundabouts are proposed at Calks Ferry Road and ramp terminal intersections to facilitate turning movements from ramps to Calks Ferry Road instead of intersections controlled by stop signs or signals. Calks Ferry Road is proposed to be widened to four lanes (two each way) prior to the roundabouts and between the new interchange limits. Ramp “A” is the I-20 westbound (WB) exit ramp to Calks Ferry Road and terminates in a roundabout. At the roundabout, motorists have the option to access northbound (NB) or SB Calks Ferry Road. Ramp “B” is the I-20 WB entrance ramp from Calks Ferry Road. Ramp "B" crosses the abandoned weigh station site which will be removed. Ramp “C” is the I-20 EB exit ramp to Calks Ferry Road and terminates in a roundabout. At the roundabout, motorists have the option to access northbound (NB) or SB Calks Ferry Road. Ramp “D” is the I-20 EB entrance ramp from Calks Ferry Road.