Why Truckers Never Turn Off Their Engines in Winter

It's 3 a.m. at a truck stop in North Dakota, 20 below zero. Two hundred semis are parked in the dark, the drivers are asleep, and the engines are running. All night. It looks like the most wasteful habit on the road. It's actually survival. This is the hidden engineering behind one of trucking's strangest rules: what happens to diesel fuel, a diesel engine and its batteries when the temperature drops, and why a running engine can be the difference between a bad night and a disaster. In this video: • Why diesel fuel can turn into jelly and starve the engine • Why a truck engine has no spark plugs, and why that's a problem at 20 below • What it really costs to idle a big rig all night • The night 48 miles of I-95 froze solid, and who stayed warm Would you rather sleep in a running truck or a frozen one? Tell me in the comments. 🔔 Subscribe for more giant things explained simply. CHAPTERS 0:00 Why the engines run all night 0:59 Inside the big rig 1:41 Reason #1: the engine is the furnace 1:58 Reason #2: diesel turns into jelly 3:53 Reason #3: no spark plugs 5:32 Reason #4: frozen DEF 6:04 Imagine you shut it off 6:55 The cost of idling 8:03 The night I-95 froze 9:23 What's changing 10:15 Zooming out Sources: EPA SmartWay; Argonne National Laboratory (truck idling); FMCSA (hours of service); American Trucking Associations (freight share); Cenex (winter diesel); NACFE; news coverage of the January 2022 I-95 shutdown in Virginia. #Trucking #Diesel #Winter