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Old 11-12-2017, 11:36 AM   #1
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How wide of a driveway entrance.....

Have a question about a 2018 Bay Star 3401 with a 228 wheel base on a 24,000 chassis. It needs to turn 90 degrees off a straight roadway into a driveway. How wide does the driveway entrance have to be to pull in safely? Is there a formula for figuring out the turning radius with a 228 wheel base. The rig is 34.11 feet in length. Getting a new driveway so I can make the opening into it pretty much what I would need. Any other factors I should consider as well? Thanks in advance for any input
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Old 11-12-2017, 11:59 AM   #2
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I don't have a design equation for you, but I would also consider the width of the street you're pulling off from, length of the driveway, are there any other vehicles park along this street. Other factors, light posts, mail boxes, trees, slopes, etc.

I know people park there Class A&C rigs in a single width drive way off a typical residential road.
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Old 11-12-2017, 12:06 PM   #3
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I would find a empty parking lot and take a 5gal bucket with some soapy water and a long handle brush and have someone or two wet down your left front and right rear tires(for a right turn approach)and check your track?


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Old 11-12-2017, 12:19 PM   #4
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Thumbs up

I will actually measure the width of the street, it is a typical two way street but I never thought of measuring it.

There are not any cars parked on the street. I will be making a left turn into the driveway entrance pointing east from the west bound lane of the roadway heading south if that helps.

I don't have the rig yet so I was hoping to just get the numbers for the width since I am doing the driveway shortly. I am guessing it has to be a little wider than what it is because when making a left turn I don't want to have the back tires run over the Belgium block.

Will get back with all the specific measurements. Just though there was a turning formula for this sort of stuff.
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Old 11-12-2017, 12:35 PM   #5
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As long as the street is wider than the RV is long you should be able to back it into any driveway that is wider than the RV. Probably the determining factor would be how much help you would have from a spotter, how proficient you are and how many times you want to pull forward and back. My lot in Yuma has a brick fence across the front with a 16 foot wide gate. The road is 46 feet wide and my motorhome is 41.5 feet long. It usually takes me two times forward and back to get lined up. Wife is an excellent spotter.
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Old 11-12-2017, 12:37 PM   #6
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The formula will depend upon the unit you are going to purchase.

You need to know the wheelbase and the steering cut angle if a motorhome. Truck and trailer will be different as will a truck and 5er.

You will consider the width of the roadway, driveway and then determine the radius beside the roadway and driveway.
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Old 11-12-2017, 12:48 PM   #7
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Deja Vu! Didn't we just have a thread exactly like this from someone in Chuluota, FL?
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Old 11-12-2017, 12:52 PM   #8
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We have a 37 ft Dutch Star and towing a Jeep Wrangler. Our drive way was gravel and uneven so that the RV rocked back & forth hitting the evergreens on either side of driveway. We had a concrete driveway poured after numerous encounters with the elements. The width of the driveway is 18 feet with the apron between the end of the concrete and the asphalt roadway is 23 feet. Probably wouldn't need the 23 ft. if you have no toad but the 18 ft seems about right.
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Old 11-12-2017, 01:32 PM   #9
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Quote:
Originally Posted by rg neumann View Post
The width of the driveway is 18 feet with the apron between the end of the concrete and the asphalt roadway is 23 feet. Probably wouldn't need the 23 ft. if you have no toad but the 18 ft seems about right.
Yup pretty close to what we have.. 40' DP, 16' wide pad with a 20' (tapered) apron to the sidewalk & street
I have to "blind side" back it onto the pad
I normally only have 1 pull up to get square.
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Old 11-12-2017, 01:35 PM   #10
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"the steering cut angle if a motorhome" ...where do you find that information? The wheelbase is 228 for sure.

Thanks for the general specs on some other rigs. Have over 100ft into the driveway it is the entrance width I am concerned about.

I am just guessing the 34.11, lets just say 35ft, length of the rig is going to be more that the width of the street I am turning off of into the driveway. But I will measure the width of the street I am turning off of into the driveway this week
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Old 11-12-2017, 01:36 PM   #11
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Since you are building new driveway, don't forget to factor in weight of you new motorhome. Most drives are designed for cars and light/medium duty trucks. Your weight will be up to five or six times higher.
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Old 11-12-2017, 01:40 PM   #12
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Quote:
Originally Posted by Rvlegaleagle View Post
"the steering cut angle if a motorhome" ...where do you find that information? The wheelbase is 228 for sure.

Thanks for the general specs on some other rigs. Have over 100ft into the driveway it is the entrance width I am concerned about.

I am just guessing the 34.11, lets just say 35ft, length of the rig is going to be more that the width of the street I am turning off of into the driveway. But I will measure the width of the street I am turning off of into the driveway this week
Newmar or your dealer can get you the info - itís chassis dependent.

Are you pulling it in, then backing it out? That might be more of a consideration.
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Old 11-12-2017, 01:56 PM   #13
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https://nacto.org/docs/usdg/curb_ret...gcharlotte.pdf

Page 5 has an interesting table that will have information you can use.
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Old 11-12-2017, 02:13 PM   #14
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Quote:
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Since you are building new driveway, don't forget to factor in weight of you new motorhome. Most drives are designed for cars and light/medium duty trucks. Your weight will be up to five or six times higher.
Yup.. be looking at a 6" to 8" depth of pad with a 5 bag mix.. and at least 4" of compacted base rock, depending on your soil & drainage considerations.
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