Emergency stopping (question)

Discussion in 'Questions From New Drivers' started by Acdeep, Jul 9, 2019.

  1. TripleSix

    TripleSix God of Roads

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    You are correct, sir.
    I don’t have to be able to see around the curve. I will just see the person way up ahead of me that can see around the curve. If there’s a problem, you will see his brake lights before you lose sight of him. That’s your warning.
     
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  3. Pedigreed Bulldog

    Pedigreed Bulldog Road Train Member

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    Even on a brand new chamber, the spring brakes are weaker than the service brakes. Think about it. It only takes around 40 psi to completely overcome the spring pressure...but the service brakes can apply over 100 psi. Unless your air system has been depleted to the point where the tractor protection valve is on the verge of popping the brakes automatically, you'll ALWAYS have more braking force when using the service brakes.

    Not only that, but the typical road tractor only has spring brakes on 3 axles...1 drive and 2 trailer. Heavier spec'd trucks will have them on both drives...so you're up to 4 axles. Service brakes are on all 5 axles.

    One last point, the anti-compounding valve will prevent both spring AND service brake application at the same wheels, so while you aren't gaining anything, you might very well be hurting your efforts to stop quickly.
     
  4. MartinFromBC

    MartinFromBC Road Train Member

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    You went out of your way to miss the point obviously.
    My point was clear, leave a big gap for safety, then some idiot pulls into it, and until I can recreate a nice gap yet again, my safety margin is temporarily gone. But hey thanks for not comprehending what I wrote.
     
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  5. Powder Joints

    Powder Joints Subjective Prognosticator

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    I get that I drive Los Angeles freeways normally or at least alot of the time both rush hours, In I try to set my pace leaving the following distance, and say a car pulls into the space getting on the freeway I'll back off the throttle a little, but most of the time there passing thru to another lane. I just expect it, the other thing that goes along with following distance is paying attention to what happening down the road ahead of you.
    There are some many good app's now I use google maps more than my GPS in the metro areas, I also use Waze during rush, at time I find Google to be very dependable though, especially on the 405 from The Getty down thru South Bay. I do LAX a lot.
     
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  6. Powder Joints

    Powder Joints Subjective Prognosticator

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    Get on a first name basis with the creator, your going to meet him in the near future. First thing these noob's need to get thru there heads, Is this is a large heavy vehicle, not a Yamaha 250. Start out with a bit of reservation as to how fast you can stop and drive slower than you think is necessary till you at least learn the job.

    At 55 MPH on dry pavement with good brakes, it can take a heavy vehicle about 390 feet to stop. It takes about 4 seconds. total stopping distance: At 55 MPH it will takeabout 6 seconds to stop a truck and the truck will have traveled about 512 feet.
    Now add in down grades, rain, snow, dirt or oil on the highway.
    Slow down to start with plenty of years ahead to go fast after you learn the job.
     
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  7. x1Heavy

    x1Heavy Road Train Member

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    I refuse to abuse the truck or hours just to rectify a emergency imposed by dispatcher time frame wise. No load is worth it short of all out war. (The kind where you decide between a can of soup or two potatoes each week on a ration card. Or perhaps your worth to the Nation is deemed so low that you are allowed 1 gallon per month and so on.)

    Always mentally plan worse case scenario around the next curve. Say a overturned tour bus with bleeding bodies everywhere. Having to stop on blood, animal or human vs pavement is a creep out experience. Makes me think I am sliding on their souls or something.
     
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