sentences:  One major problem with the highway is that the US 29/US 70/US 220 southbound lanes merge from the right, and exit to the left.Thus, through traffic on I-40 west and US 29 south (a major route from Virginia to Charlotte) must all merge to the other side of the freeway.A study conducted by state traffic engineers from May 1, 2006 to April 30, 2008 (the period between the I-85 relocation and I-40's relocation) concluded that "the Death Valley area" had an accident rate "higher than average for urban interstates ... but the [route] was safe anyway."