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MrScorpio

(73,631 posts)
Tue Aug 12, 2014, 11:03 PM Aug 2014

Let's say you're in a car which that's in a moving semi-trailer. Let's assume that it's an automatic

The back flips down to make a ramp, and you throw the car into reverse to back down that ramp.

Now, instead of doing an immediate 180 and ending up facing traffic, you throw the gear into drive, while you're still in reverse, so that way you can pass the moving truck that you've just exited.

Now, how do you do this without coming to a complete stop first? Aren't you going to fuck up the transmission? Are today's vehicles even capable of being put into drive while they're still moving in reverse?

Or do you either do the 180 or just come to that complete stop first?

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kentauros

(29,414 posts)
1. Put it in neutral while you're still rolling backward
Tue Aug 12, 2014, 11:09 PM
Aug 2014

and then in drive. I don't think it will screw up the transmission then. But it would it you went directly from reverse to drive. That's probably why neutral is situated between them.

ETA: the forward momentum of the truck would get your car moving forward enough to put it into drive without screwing up the transmission. Just don't floor it in reverse initially. You want to only get out of the truck, not crash

pinboy3niner

(53,339 posts)
3. I can't tell you how long that question has been weighing on my mind
Tue Aug 12, 2014, 11:16 PM
Aug 2014

By the way, good luck with your new gig as an amateur stunt driver in that new Fast & Furious sequel. Sounds like you're gonna need it.

Wounded Bear

(58,660 posts)
6. I think you need a standard transmission for that stunt...
Tue Aug 12, 2014, 11:28 PM
Aug 2014

Even in neutral, if you put an auto transmission into drive in a moving vehicle, it starts in low gear. Kind of like locking up the brakes.

MADem

(135,425 posts)
8. I drive a standard!
Tue Aug 12, 2014, 11:41 PM
Aug 2014

But don't they make cars now that can switch between automatic and standard...?

A HERETIC I AM

(24,369 posts)
10. The Mythbusters did an episode on this subject.
Wed Aug 13, 2014, 03:53 AM
Aug 2014

Can't recall whether they used an automatic or not though.

Thing is, most automatics will roll backwards in Drive if the grade is steep enough. The ramp in your scenario would suffice.

As soon as the rear wheels hit the pavement they would immediately spool up to match the speed of the truck. Gravity would continue to pull you back off the ramp till the front wheels are on the ground. Then just steer left and go around the truck.

kentauros

(29,414 posts)
11. I didn't know that about the transmission remaining in drive
Wed Aug 13, 2014, 03:56 AM
Aug 2014

but you explained better what I was getting at with "forward momentum"

rurallib

(62,416 posts)
12. if you stopped at a stoplight on a hill some day
Wed Aug 13, 2014, 09:44 PM
Aug 2014

take your foot off the brake for a few seconds - it will roll backwards - even in drive.

kentauros

(29,414 posts)
13. Yeah, there's one spot in Austin when I need to get on MoPac S
Thu Aug 14, 2014, 07:44 AM
Aug 2014

where it's a steep hill up at a stop light. I have to use the handbrake to keep from rolling backwards! That's not a technique I ever have to use in Houston

CBGLuthier

(12,723 posts)
14. Nothing else matters so long as you follow the first rule of Italian Driving
Thu Aug 14, 2014, 09:03 AM
Aug 2014

Gumball




Just realized this scene has two of my favorite actors and both died far too young.

benld74

(9,904 posts)
16. Sort of reminds me of a Steven Wright joke
Thu Aug 14, 2014, 01:15 PM
Aug 2014

Got a great deal on a house near the interstate

Only problem is I have to be going 80mph when I back outta my driveway.

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