This Labor Day weekend was the slowest in a decade on the I-70 mountain corridor, but not by much. Just over 180,000 vehicles traveled the Eisenhower-Johnson tunnels in four days, Friday into Monday. 4-day Labor Day traffic (at the Eisenhower-Johnson tunnels)2025… 180,0612024… 187,4192023… 186,1792022… 188,8042021… 183,9542020… 183,0722019… 198,8622018… appx. 192,0002017… 192,6812016… 184,6412015… 174,652The last time Labor Day traffic slipped below 180,000 vehicles was 2015 with more than 174,000 vehicles in four days. Summer falls shortLooking back on three months of summer – June through Labor Day, historically the busiest time on the mountain corridor – this year showed another dip in traffic.