Manara-SY060616
H6/19/2009) Carol Dye - RE: ::;tandard Bu~De~ignVehicles
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Attachments:
<scot.johnson@kimley-horn.com>
<kgriffin@ci.coppell.tx.us>
<MDIAMOND@ci.coppell.tx.us>, <sadak.shaik@gmail.com>
6/16/200912:03 PM
RE: Standard Bus Design Vehicles
AASHTO 2004 Standard Buses.pdf
Sorry, here it is.
Scot A. Johnson, P.E., PTOE
Kimley-Horn & Associates, Inc.
12700 Park Central Dr., Suite 1800
Dallas, Texas 75251
Ph: 972-776-1735 Fax: 972-239-3820
scot.johnson@kimley-horn.com
-----Original Message-----
From: Ken Griffin [mailto:kgriffin@cLcoppell.tx.us]
Sent: Tuesday, June 16, 2009 11 :57 AM
To: Johnson, Scot
Cc: Marcie Diamond; sadak.shaik@gmail.com
Subject: Re: Standard Bus Design Vehicles
Scot
There are no attachments.
Ken Griffin
>>> <scot.johnson@kimley-horn.com> 6/16/200911 :45 AM >>>
Ken,
Attached are sheets from the 2004 Green Book as we discussed. As you can see the large school bus
(S-BUS-40) has the 20' wheelbase, but its steering angle is much less than the 40' transit bus
(CITY-BUS), so their turning radii are more similar than the difference in wheelbase might indicate.
Let me know if you need anything else.
Scot
Scot A. Johnson, P.E., PTOE
Kimley-Horn & Associates, Inc.
12700 Park Central Dr., Suite 1800
Dallas, Texas 75251
Ph: 972-776-1735 Fax: 972-239-3820
scot.johnson@kimley-horn.com
I (6/19/2009) Ca~oIDye- AASHTO 2004St~ndard Buses.pdfH
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Page 1 I
A Policy on
Geometric Design of
Highways and Streets
2004
Fifth Edition
American Association of State
Higbway and Transportation Officials
444 Norib Capitol Street, N.W., Suite 249
Wasbington, D.C. 20001
(202) 624-5800
www.transportation.org
CCopyright 2004, by the American Association of State Highway and
Transportation Officials. All Rights Reserved. This book, or parts thereof, may
not be. reproduced in any form without written permission of the publisher.
Printed in the United States of America.
ISBN: 1-56051-263-6
I. (6/~9/2009)Carol()ye ~.. AASHTO 2004 Standard Buses.pdf
Page 2 I
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AASHTO--Geometric Design of Highways and Streets
US Customary
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24 42 45 45 42.0 38.9 39.4 39.8 40 45
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38 40.8 40.8 37.8 34.9 35.4 35.5 36 41 i
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28.3 27.6 25.5 24.5 23.8 25.4 21.3 19.3 17.0 l
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Symbol WB~2. WB~5.. WB~7D WB-l<ld'r INB-l09o. MH PfT PIB MHIB TRJW
or WB~7
45 45 45 45 60 40 33 24 50 18
41 41 41 41 56 36 30 21 46 14
7.9 4.4 19.3 9.9 14.9 25.9 17.4 8.0 35.1 10.5
Design vehicle with 48-ft trailer as adopted In 1982 Surface Transportation Assistance Act (ST AA).
oeslgn vehicle with 53-ft trailar as grandfatherad In with 1982 Surface Transportation Assistance Act (STM).
The turning radius assumed by a designer when Investigating possible turning paths and Is set at tha centerline of
the front axle 01 a vehicle. If the minimum turning path is,assumed. the eTR approximately equals the minimum
design turning radius minus one-half the front wldth of .the vehicle.
School buses are manufac1ured frornA2.passenger,'to; 84,.passenger. sizas.This corresponds to wheelbase
'lellQlhsofU.O ftlo,.2~.():,/l;fllS/lIldN8Iy.Foc;,these dilfet'8nt,siz8S. the minimum design turning radii vary from
. ';':'28~,ft;t;'39,4 ftilndthe miillmunl1'nSid1ir.adli vary fiom.14:0 it 10.25.4 ft. .' . .
,- Turning radius 1s for 15()..200l\p '1ractorWlth::one .18.5 IUong'wagon attached to hitch point Fronl wheel drive is
!" .. .' disengaged and Without brakes belngc applied.
Exhibit 2-2. Minimum Turning Radii of Design Vehicles (Continued)
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r (6/19/2009) CarojDye'::'AASHTO 2004Stan~dard Buses:pdf.
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Design Controls and Criteria
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Exhibit 2-7. Minimum Turning Path for City Transit Bus (CITY-BUS) Design Vehicle
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AASHTO--Geometric Design of Highways and Streets
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3'.66m.
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6.49m
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Exhibit 2-8. MInimum Turning Path for Conventional School Bus (8-BUS-l1 [8-BU8-36))
Design Vehicle
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'Page 41
1(~/19!2009) Carol Dye ~~MS~TO 200~ Sta~~ard Buses:pdf .
eage 5'1
Design Controls and Criteria
(T,.nsit Style)
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Exhibit 2-9. Minimum Turning Path for Large School Bus (S-BUS-12 [S-BUS-40J)
Design Vehicle
27
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