Answers to Interactive Backing Questions
A.
If the driver doing the back in the image to the right were to continue, it would soon look like the graphic to the left. You must remember that not only are you backing the tail of the trailer, you are also backing the nose of the trailer. |
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Why won't this tractor/trailer go into the dock straight from the position
it is in now? |
B.
A. Nope. Turning the wheel to the RIGHT would make the back of the trailer turn even sharper to the left. This would increase the angle even more -- leading to a jackknife position.
Which way would you turn the wheel to make the tractor and trailer straight again as in graphic to the right?
B. Good Job!! By turning the steering wheel to the LEFT, you would decrease the angle between tractor and trailer and would eventually end up straight. ("eventually" because it would depend how sharply you turned the wheel.)
Which
way would you turn the wheel to make the tractor and trailer straight again as
in graphic to the right?
C. No, Sorry that wouldn't work. If you were to keep the wheels straight, the trailer would continue to turn in the direction it had been turning. In this particular image, by keeping the steer tires straight, the back of the trailer would turn to the left.
Which way would you turn the wheel to make the tractor and trailer straight again as in graphic to the right?
C.
A. Sorry, there's no way that with the steer tires turned as they are that the trailer would curve in this direction. Since the steer tires are turned to the left and the tractor and trailer are almost straight to each other, the end of the trailer will soon begin to turn to the right.
If the barrel were NOT there and the driver proceeded back with the steer tires "pointed" just as they are in the picture, (approximately a full turn to the left) upon crossing the red line, about where would the rear right trailer tandem (black dot) cross the red line? (To try again, click an area on the image to the left below.)
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B. It is very doubtful that the trailer would turn and find itself here since the steer tires are turned to the left. Because they are turned left and the tractor and trailer are almost straight, the end of the trailer will soon turn to the right.
If the barrel were NOT there and the driver proceeded back with the steer tires "pointed" just as they are in the picture, (approximately a full turn to the left) upon crossing the red line, about where would the rear right trailer tandem (black dot) cross the red line?
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C. You nailed it!!! Good job. You're right -- with the steer tires turned to the left and the tractor/trailer nearly straight (or very soon to be), the back of the trailer will almost immediately begin to turn to the RIGHT -- and end up on the right side of the dock.
If the barrel were NOT there and the driver proceeded back with the steer tires "pointed" just as they are in the picture, (approximately a full turn to the left) upon crossing the red line, about where would the rear right trailer tandem (black dot) cross the red line?
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D.
A. Good Job! You're right... the only thing that can save this impending fender bender is a pull up. There just isn't enough space to get the back of the trailer to turn in time.
Because of the minimum of 6 - 8 feet that it requires for the trailer to change direction after turning the steering wheel, this back cannot be fixed by doing anything other than:
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B. This might have been the correct response had it been done earlier. It's now too late. Remember it takes 6-8 feet minimum to see the effects of what you do at the steering wheel. In this instance, we don't have 6-8 feet to spare waiting for the result.
Because of the minimum of 6 - 8 feet that it requires for the trailer to change direction after turning the steering wheel, this back cannot be fixed by doing anything other than:
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C. Sorry but this is probably the worst thing you could do at this point. The trailer would end up on top of all the cones.... Remember that if you want to get straight, or "get under" the trailer, you turn the wheel in the direction you see more trailer. A turn the left at this point would begin that process.
Because of the minimum of 6 - 8 feet that it requires for the trailer to change direction after turning the steering wheel, this back cannot be fixed by doing anything other than:
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E.
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A.
(left) Good Job,
you're right! The
steer tires are turned to the left - which will bring the tractor straight
with the trailer soon -- but not soon enough in this case. Since the trailer
will continue to turn to the left until it is straight, it will be into the
barrels before the tail turns right. |
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B.
(middle) Nope.
Were
you fooled into thinking because the steer tires are turned left that the
trailer should be going right? That is true BUT not unless the
tractor/trailer is straight!!! So, until they are straight, the trailer will
continue to turn left -- before it turns to the right. |
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C.
(right)
Nope.
Were you fooled
into thinking because the steer tires are turned left that the trailer
should be going right? That is true BUT not unless the tractor/trailer is
straight!!! So, until they are straight, the trailer will continue to turn
left -- before it turns to the right. |
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F.
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A. You may have the right idea here BUT are underestimating the amount of time it takes to get a 53 foot trailer turning. If you thought it would come in close to the barrels on the left side, that's what you've done. Remember it will take something like 6-8 feet before any effect can be seen at all so this trailer -- even with the steer tires turned right -- will actually proceed straight back for 6-8 feet before it ever begins to turn at all. |
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If the driver were to keep them in this position and proceed back, where do you think the left side trailer tires would end up? |
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B. It is very doubtful that the back of the trailer will turn this quickly ... you are likely underestimating the amount of time it takes to get a 53 foot trailer turning. Remember it will take something like 6-8 feet before any effect can be seen at all so this trailer -- even with the steer tires turned right -- will actually proceed straight back for 6-8 feet before it ever begins to turn at all. |
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If the driver were to keep them in this position and proceed back, where do you think the left side trailer tires would end up? |
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C. Good Job! You're right. Nice job. You knew that even with the steer tires turned right that it would take time to get the back of the trailer turning in towards the dock. |
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If the driver were to keep them in this position and proceed back, where do you think the left side trailer tires would end up? |
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hey there's nothing down here!!!
