Traffic backs up in the northbound lanes of Interstate 15, near Sahara Avenue exit in Las Vegas, on Thursday, March 8, 2018, as the “Main Event,” the $1 billion reconfiguration of the Spaghett …

Traffic backs up in the northbound lanes of Interstate 15, near Sahara Avenue exit in Las Vegas, on Thursday, March 8, 2018, as the “Main Event,” the $1 billion reconfiguration of the Spaghetti Bowl interchange, enters its fourth day. (Bizuayehu Tesfaye/Las Vegas Review-Journal) @bizutesfaye