The diverging diamond interchange (DDI) 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. The DDI is a type of diamond interchange in which the opposing directions of travel on Calks Ferry Road temporarily cross over at a new signal on either side of the interchange. Traffic crossing over I-20 on the overpass bridge operates on the opposite (left) side, facilitating more left turns onto the I-20 entrance ramps without increasing the number of lanes and traffic signals. This interchange design reduces the number of conflict points, reduces the need for separate turn lanes, and facilitates higher left turn movements onto I-20 entrance ramps. Depending on the direction of travel, motorists will access the interstate one of two ways: 1. Before they cross to the other side at the traffic signal, drivers may go right to reach the on-ramp. 2. After they have crossed to the other side, drivers may simply turn left, without having to stop or wait for any oncoming traffic, to reach the on-ramp to go in the other direction. Motorists going straight through the intersection proceed through a second traffic signal and follow their lane back to the right side of the road. Calks Ferry Road is proposed to be widened to four lanes (two each way) prior to the ramp terminal intersections and remain four lanes within the new interchange limits. Ramp “A” is the I-20 westbound (WB) exit ramp to Calks Ferry Road which is located adjacent to Red Bank Creek and floodplain. It provides motorists options to turn onto 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. It provides motorists options to turn onto NB or SB Calks Ferry Road. Ramp “D” is the I-20 EB entrance ramp from Calks Ferry Road, which will be used primarily by Calks Ferry Road NB traffic traveling toward Columbia using I-20.