While traveling along the interstate highways, you’ve you seen burned areas alongside the road. A few weeks ago in northern Oklahoma, we saw a roadside burn that covered over a square mile. Years ago a primary cause of highway fires was burning cigarettes tossed out the windows. Some drivers are still either stupid or ignorant and continue doing that; but currently fires are more often started by smoldering rubber from disintegrating truck tires. How does that happen?
The interaction between the rotating tires and pavement generates a lot of friction, and friction generates heat. The faster the movement, the higher the heat. Rub your hands together and see what I mean. At 70 mph, truck tires (at an average diameter of 41 inches and inflated to 100 psi) rotate about 34,433 times each hour and can attain temperatures of 120 degrees F. This heat can raise the tire pressure to about 120 psi.
Sometimes the drivers or maintenance personnel fail to check the tires for proper inflation, and an underinflated tire will get much hotter. And if the truck is overloaded, the problem is compounded. If the heat and pressure get too high, chemical decomposition in the tire material takes place which weakens the tire structure and the resulting gasses increase the internal pressure.
Several other reasons a tire can get too hot are: excessive truck speed, very high road temperature, unequal pressures on tires mounted on double wheels, and over-heated brakes. The consequences can be dangerous; and whether the tire explodes or unravels, public safety becomes an issue.
The material from a tire that unravels and flies apart over several miles is already smoldering. If the hot rubber lands off the road, the heat can ignite dried grass and weeds. The deteriorating tire also leaves a trail of debris on the highway which presents a safety hazard.
The other problem is when the tire ends its life in a violent explosion. The explosion and resultant shrapnel can cause serious and even fatal injuries.
Some time ago as we were heading west toward Amarillo on I-40, we were about to pass an 18-wheeler when we heard a sound that resembled an army tank firing a round. Simultaneously, a cloud of smoke and dust and a barrage of shattered tire erupted from the truck’s rear wheel-assembly.
In that event, I didn’t have time to think things through and plan my responses. Instead, I instantly reacted according to the training I had previously received. I instantly checked the rear-view mirror for traffic. No one was close. I then hit the brake and swerved across both lanes to avoid the larger pieces of tire that were hurtling through the air. Superheated rubber fragments set grass on fire and other shrapnel damaged our windshield. Having avoided the larger pieces, we received no dents in the car. It was all over in four seconds.
But the secondary problem – the grass fire – was also initiated. Have you seen signs that say “Don’t drive into smoke?” I hope you obey them because grass-fire smoke is dense and can reduce vision to less than ten feet. However, the fire was not our problem, but it did become a problem for those who came behind us.
Do you know that sometimes people have a “blow-out” in life? It may be losing a job, death of a loved one, a major health issue, drugs, alcohol, anger, or any of a hundred other things. And the “shrapnel” – some form of emotional upheaval or even pots, pans, and books flying through the air – appears to be aimed at those closest to the situation. We need to know how to avoid the shrapnel, and those who come behind need to know how to safely “drive through the smoke.” What do we do?
We need to remember that the explosion is not really meant for us, so don’t take the hit personally. But we can’t wait to “get trained” at the critical moment; we need to train ahead of time. Our primary manual for learning how to respond is the Bible, and our form of response should be anchored in the teachings of Jesus Christ.
Your pastor and counsellor can help, but remember Proverbs 3:5-6 – “Trust the Lord with all your heart, and don’t depend on your own understanding. Remember the Lord in all you do, and he will give you success.” And please read 1 Corinthians 13. There are only 13 verses in that chapter, and they give priceless advice to help us overcome interpersonal difficulties.
Let the wisdom that comes from God’s word guide you. Only then can you safely maneuver through the explosions and resulting shrapnel of life.