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 > Effect of weight on braking for trucks.

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Johno02

Lexington, TN USA

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Posted: 09/09/20 09:31pm Link  |  Quote  |  Print  |  Notify Moderator

Guess what!! You are not driving a sporty lightweight car anymore. Go to a good driving school and get some instructions on how to drive a heavy truck. That is the reason there are so many accidents on the roads, because the idiots behind the wheel have no idea how to drive safely. Yes, the heavier it is, the harder it is to stop. It is simple... High school physics class. Too many think they know how to drive, but have no idea about how to stop safely. And always, always leave yourself at least double the amount of space you need to stop. the car or light truck in front of you can always stop dead much quicker than you can. BTW, an experienced LEO once told me that you can always take an unsafe driver to court, but not a barrier, ditch or cliff. So what you hit is your decision.


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kohldad

Goose Creek, SC

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Posted: 09/09/20 10:17pm Link  |  Quote  |  Print  |  Notify Moderator

I compensate by slowing down when loaded. My top speed is always under 65mph even when traveling out west where the speed limit was 80. I'm usually running about 62 interstate and 57 on the main secondary roads. If traffic backs up behind, I'll find some place to pull over to let it clear. Though on a recent 9,000 mile trip, I think I only had to pull over dozen times and never on the interstate. I usually let off the throttle and coast or down shift when stopping.

On my 2004 diesel with manual transmission, at 150,000 miles my front brakes were still had 50% pad left despite hauling the TC for 50,000 miles and a 12,000# trailer for over 20,000 miles. Rear brakes had almost no sign of wear.

On my current gas truck with auto, I have 105,000 miles of which 65,000 miles were carrying the camper. Front brakes are about 40% remaining, rears are hardly worn. By taking it easy and down shifting, I usually only need light braking. Even coming down the Beartooth I only had to use the brakes for the switchbakes. Same coming down 14 on the east side of the Big Horns.


2015 Ram 3500 4x4 Crew Cab SRW 6.4 Hemi LB 3.73 (12.4 hand calc avg mpg after 92,000 miles with camper)
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jimh425

Western MT

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Posted: 09/10/20 07:00am Link  |  Quote  |  Print  |  Notify Moderator

You need to rethink the 62 in an 80 or know that it’s just a matter of time before someone runs into you. You’ll be just as dead when you go off the road whether you are the one driving slow or fast. I also don’t understand why 57 in a 65 makes sense when many of the back roads are 65 or more as well.

It would be better to get off the main roads if you want to drive that slow. If you weren’t aware, it’s pretty common for people to drive 5 over. So, you are talking 85 vs 62. That drastically reduces the reaction time of the other drivers since you are traveling more than 25% slower than a lot of the traffic.

Fwiw, the non interstate roads typically have better views and are usually more direct, so it would be a win for you to stay off the interstates. Still, if you are forcing people to pass on 2 lanes due to your dramatically slower speed, there is still the chance that you will be the cause of an accident on the slow roads if you drive even slower on the 2 lanes.

Btw, I’m not saying drive 80 or 85. I’m simply reminding that the main cause of accidents on the interstates is the difference in speed, and the biggeest cause of accidents on backroads is passing. So, anything you can do to not contribute to those two issues would be good.


'10 Ford F-450, 6.4, 4.30, 4x4, 14,500 GVWR, '06 Host Rainer 950 Dbl Slide, Torklift Talon tiedowns, Glow Steps, and Fastguns. Bilstein 4600s, Firestone Air Bags, Hankook DH-01 225/19.5 Fs, Curt front hitch, Energy Suspension bump stops.


JRscooby

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Posted: 09/10/20 07:41am Link  |  Quote  |  Print  |  Notify Moderator

jimh425 wrote:

You need to rethink the 62 in an 80 or know that it’s just a matter of time before someone runs into you. You’ll be just as dead when you go off the road whether you are the one driving slow or fast. I also don’t understand why 57 in a 65 makes sense when many of the back roads are 65 or more as well.

It would be better to get off the main roads if you want to drive that slow. If you weren’t aware, it’s pretty common for people to drive 5 over. So, you are talking 85 vs 62. That drastically reduces the reaction time of the other drivers since you are traveling more than 25% slower than a lot of the traffic.

Fwiw, the non interstate roads typically have better views and are usually more direct, so it would be a win for you to stay off the interstates. Still, if you are forcing people to pass on 2 lanes due to your dramatically slower speed, there is still the chance that you will be the cause of an accident on the slow roads if you drive even slower on the 2 lanes.

Btw, I’m not saying drive 80 or 85. I’m simply reminding that the main cause of accidents on the interstates is the difference in speed, and the biggeest cause of accidents on backroads is passing. So, anything you can do to not contribute to those two issues would be good.


Let's see, 85-62 is 23. Is it your opinion that most drivers can not miss a stopped car on a 4 lane road when driving 23 MPH? And the fault is the slow drivers?

jimh425

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Posted: 09/10/20 07:58am Link  |  Quote  |  Print  |  Notify Moderator

JRscooby wrote:

Let's see, 85-62 is 23. Is it your opinion that most drivers can not miss a stopped car on a 4 lane road when driving 23 MPH? And the fault is the slow drivers?


It’s not about fault. It’s about increasing the chance of being in an accident.

https://sites.psu.edu/siowfa15/2015/09/18/is-driving-faster-safer/

According to state and federal studies, drivers that are driving significantly below the average speed are the ones that are most likely to get involved in an accident. Studies show that the most accidents occur when the driver is driving at 10 mph slower than the speed limit. So someone going 45 in a 55 has a bigger chance of getting into an accident than someone driving at 65-70 mph.

The main problem on roads that causes accidents is the differences in speed, rather than speed itself. While some people are going faster than other, some go slower which causes the traffic to flow unevenly. If the speeds limits are raised to comply with the actual travel speeds, the roads become safer, because the traffic now flows more evenly and people start going to the same speeds. This actually shows that drivers are not affected by the speed limits that much, but rather slow drivers. The National Highway Traffic Safety Administration (NHTSA) Says that only 30% of the accidents that are fatal are accidents in which the driver was speeding. This does not mean that the speeding actually is the cause of the accident. A study conducted by the Florida Department of Transportation says that accidents that were caused by speeding is actually 2.2%. This shows that if people drive faster all together it is actually safer than driving slow.

pianotuna

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Posted: 09/10/20 08:05am Link  |  Quote  |  Print  |  Notify Moderator

For the sake of the world it would be best to bring back the double nickel speed limit.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, soon to have SiO2 batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

Kayteg1

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Posted: 09/10/20 09:05am Link  |  Quote  |  Print  |  Notify Moderator

jimh425 wrote:

You need to rethink the 62 in an 80 or know that it’s just a matter of time before someone runs into you. You’ll be just as dead when you go off the road whether you are the one driving slow or fast.

Not lately. I drive my TC at 60 mph all the time and after 30k miles no issues with slow speed.
Seems lately business is slower and truckers drive for fuel economy.
In the past (like 20 years ago) on roads in AZ and Nebraska I have seen semitrucks doing 90 mph.
A month ago I drove my van via NV, UT and WY. Driving 75 mph I was basically passing everyone on 80 mph freeway.





Grit dog

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Posted: 09/10/20 09:24am Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

For the sake of the world it would be best to bring back the double nickel speed limit.


Oh gawd no!


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Grit dog

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Posted: 09/10/20 09:25am Link  |  Quote  |  Print  |  Notify Moderator

Kayteg1 wrote:

jimh425 wrote:

You need to rethink the 62 in an 80 or know that it’s just a matter of time before someone runs into you. You’ll be just as dead when you go off the road whether you are the one driving slow or fast.

Not lately. I drive my TC at 60 mph all the time and after 30k miles no issues with slow speed.
Seems lately business is slower and truckers drive for fuel economy.
In the past (like 20 years ago) on roads in AZ and Nebraska I have seen semitrucks doing 90 mph.
A month ago I drove my van via NV, UT and WY. Driving 75 mph I was basically passing everyone on 80 mph freeway.


On an 80mph freeway you were going faster than avg at 75? No way, unless you were passing a long funeral procession or it was a convoy to the casino or bingo night!

Grit dog

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Posted: 09/10/20 09:28am Link  |  Quote  |  Print  |  Notify Moderator

Btw jimh425, you tell em!
You’re correct, driving intentionally well below posted speeds is a hazard. No different than well above. It ain’t about whether you’re right, it’s about traffic flow, stupid moves due to road rage of those trying to get around the slo poke and speed differential.

And since this is a RV forum, many folks in RVs are out of their league driving that large of a vehicle. Period, not debatable. Heck, many folks can’t handle a small car.
Difference is while I feel I’m knowledgeable and experienced to drive most anything put in front of me, and drive it well, there are those who absolutely are not, yet do it anyway.

In an analogy, just because I think I’m smart doesn’t mean I’m a surgeon and I would never claim to be nor attempt it. But plenty of folks who don’t have a clue about towing yet do it anyway and just learn (at the wrong time in life) through trial and error.
Being able to RV is not a constitutional right. And if you dont have the skill or wherewithal then you should take a sedan and a tent. Or trade your toy hauler for a class b or something

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