CADDO PARISH, La. (KSLA) – “You never know whether you’re going to be there 30 minutes or 3 hours trying to get through.”. While 18-wheelers have been banned from driving through the I-20 construction zone, it seems the ban is not stopping them. Within a 15-minute span, KSLA News 12 counted twenty-one trucks passing through I-20 at Old Minden Road.