Photos: Meet the Eisenhower Tunnel crew trying to prevent you from getting stuck in gridlock

As part of this week's feature, "Rocky Mountain High," we went inside the control room of the Eisenhower Tunnel, the world's highest vehicular tunnel, which famously crosses the Continental Divide. More than 300 million cars have passed through since 1973, and the rate today is twice what is was thirty years ago. But detailed traffic counts show that in recent years, there has actually been a slight decline in cars.