Area Needed for Turnaround

65' end to end looks like the bumper-to-bumper on a very tight daycab setup. My T370 single axle with a 150" WB is 12.8' front bumper to head of the trailer, so that pus a 52' trailer is 65'. Or maybe its 48' trailers and a longer cab? I'd double check that number to start with.

The area you've marked looks like plenty. No need for a 3pt turn I think if the truck is 65' end to end, a uturn would work. I think someone who knew what they where doing would be able to not even use the hash-marked section and do a 3pt turn in the other part of the lot, but it's hard to say without the measurements.

SCANIA makes a good truck-driving simulator for free that you might learn something trying out. They're euro trucks but it'll give you a more intuitive understanding of how parking and/or turning around works. Good excuse to get paid to play video games at work anyway right?

In tight spots, strategically painted lines in the lot make parking a LOT easier so that's also something to consider if space is tight.

 

To turn a truck around, your going to need a fair amount of space. and it needs to be clear space. all the time.

To turn a truck around using. three point, or K turn, you will need a square of at least 2.5 times the longest truck you expect to have. Most road trucks are about 24 feet " bumper to bumper", add the trailer length minus king pin set, and you should have a good over all working length. you could be looking at a range of 68 to 72 feet. A 72 foot truck will need 180 per side square to turn around.

 

What type of trucks? 53' van/refer? Spread axle trailers?

Should definitely be able to do 3 pt turn around, most of the time where I deliver that is how I have to get out and I don't have near that much room. My truck is considerably larger 75-80'

 

I think that should be plenty.

 

I would not design anything that would actually end up requiring a 3 point turn. If you can't make it in a single u-turn without hitting a curb or wall, it will be a constant source of problems (truckers damaging the back of their cab or adjacent walls/curbs/objects). For 53 ft trailers, if they have their tandems set all the way back can almost kiss the back end of their trailer on the way back out. Tandems set way forward generate a lot of tail swing that can damage building walls, etc if they run right up to it before initiating hard u-turn.

I'll look into required space dimensions and get back to you if you haven't gotten firm number by then. But on cursory consideration, the initial 115 feet seems barely adequate "typically". But if something has to park in the area or breaks down this might make it impossible for others to navigate until such time as the offending object is removed.

You might refer to this (WB-62 primarily but this is too short for typical 53 foot trailer/otr tractor combo)
http://onlinemanuals.txdot.gov/txdotmanuals/rdw/minimum_designs_truck_bus_turns.htm

 

If the space is empty now, get some traffic cones and cone it off and have the next delivery driver who comes though turn around in it.

 

Hopefully this works...
Take a look with Google Earth of how this place next to where I pick up did it... It's basically just a big 120' circle.
https://goo.gl/maps/89Y74Bajd1L2
The easy way is simply asphalt, or even gravel that whole lot and let the the truckers see what's best...

 

I don't know if you can extrapolate the measurements of this court by the FedEx facility in Midland City, GA by using known standard sizes of parking spaces and what not. This is just barely enough room to make a U turn with an OTR fleet spec tractor and a 53 ft tandem axle trailer.

https://goo.gl/maps/kUekd4dttbv

This court in Sanford, FL is not quite big enough for the same setup.

https://goo.gl/maps/FeVxMw2GpWP2

 

And please realize, truck-trailer combinations and 3-point turns really aren't a good match and are generally avoided if at all possible by experienced drivers. Even one minor backup that goes a bit too far will damage the back of many tractors hitting the side of the trailer, especially if they "almost" made it but had to back up while the trailer was already almost at the back of the cab.

Many trucks today have sucked the trailer up as close as possible to the tractor (via 5th wheel position) to enhance fuel economy, this makes it easier and faster for the tractor and trailer to "come into contact" ... a costly repair of a busted cab extender fairing.

Truck manufacturers purposely keep from creating a turning radius that is so tight as to eventually have the typical trailer from making contact with the tractor in a single, continuous u-turn. Doing a 3-point turn ... all bets are off from that point, especially with todays 53 foot trailers with far-to-the-rear set tandems.