Roundabout Practices (2016) / Chapter Skim
Currently Skimming:
Pages 59-75
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 59... ...
59 APPENDIX C Questionnaire Responses
|
From page 60... ...
Mini-Roundabouts Single-Lane Roundabouts Multilane Roundabouts Mini-Roundabouts Single-Lane Roundabouts Multilane Roundabouts Alaska 2001 3 20 9 0 11 7 Arkansas 2008 0 25 4000 California 1993 No answer 253 44 0 11 12 Connecticut 2007 2 20 1302 Delaware 2004 1 11 1 1 11 1 Florida 1996 4 13 11 0 11 3 Georgia 1999 3 130 2 2 20 0 Idaho A No answer No answer No answer No answer No answer No answer Illinois 2006 No answer No answer No answer No answer No answer No answer Indiana 2008 0 122 39 0 5 9 Iowa 2006 10 37 0709 Kansas 2000 No answer 77 34 0 13 7 Kentucky 2002 0 10 1 No answer 9 Louisiana 2002 No answer No answer No answer 0 22 1 Maine 2001 No answer 19 5 No answer 19 5 Maryland 1992 10 114 37 1 53 24 Massachusetts 2010 No answer No answer No answer 0 4 2 Michigan 2005 1 50 30 0 10 15 Minnesota 2002 2 107 32 0 24 9 Mississippi 2001 30 20 3306 Missouri 2000 5 200 20 1 55 15 Montana 2007 1 20 12 0 10 10 Nebraska 2005 No answer 6 4 No answer 6 2 Nevada 2010 No answer 10 4 No answer 4 No answer New Hampshire 2007 0 28 1806 New Mexico 2000 No answer 15 15 No answer 10 10 New York 2000 2 100 25 0 65 25 North Carolina 1999 0 229 18 0 120 16 North Dakota 2012 10 2 No answer No answer 1 No answer Oregon 1999 0 60 10 0 1 1 Pennsylvania 2005 0 20 1 0 17 1 Rhode Island 2003 No answer 3 3 No answer No answer No answer South Dakota B No answer 00003 Texas 1996 No answer No answer No answer No answer No answer No answer Vermont 1993 1 12 1601 Virginia 2002 No answer 145 15 No answer 110 5 Washington 1997 9 210 85 4 80 30 West Virginia 2010 400450 Wisconsin 1999 0 154 175 0 100 147 Wyoming 2010 No answer No answer No answer 0 5 0 A: Our agency has not built a roundabout B: Our agency has planned or designed a roundabout, but not yet built a roundabout State Approximately what year did your state agency build its first roundabout? By roundabout category, approximately how many roundabouts have been opened within your state.
|
From page 61... ...
Alaska Arkansas California Connecticut Delaware Florida Georgia Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Mexico New York North Carolina North Dakota Oregon Pennsylvania Rhode Island South Dakota Texas Vermont Virginia Washington West Virginia Wisconsin Wyoming State Urban Suburban Rural Urban Suburban Rural Urban Suburban Rural All None None Most Some Some Some Some None Yes Most Some Some All None None Yes None None None Some Most Some Some Most None Yes All None None Some Most Some None All None Yes All None None Some Some Most All None None Yes Some Most None Most Most All Most Most All Yes Most Some Some Some Some Some Some Yes None None None Some Most Some Some Most Some No Some Most None Some Most Some Some Most None Yes Most Some Some Most Some None Yes None None None Some Most Some None All None No None None None Some Most Some None None All Yes None None None Some Most Some Most Some Yes Most Some None Some Most Most Some Most Some Yes None None None Some Some None Some Some None No None Most Some Some Some Some Most Some Some Yes Most Most None Most Some Some Most Some Some Yes Some Most Most Some All No Most None Some Most Some Some Most Some None No All None None Some Most Some All None None Yes All None None Some Some Some Some Some None No None None None Some Some Some None None None No None None None Some Most Some Some Some None Yes Most Some None Most Some None All No None All None Some Most Some Some Most Some Yes None None None Some Most Some Some Most None Yes Some Some Some Most None None None No None None None Some Most Some None All None No None None None Some Some Most None None All No All None None All None None None All None Yes None None None All None None None None None No No All None None Some Some Some All None None No Some Most Some Some Most Some Yes Some Some Some Most Some Some Some Most Some Yes Most Some None Most Some None No None None None Some Some Most Some Most Some Yes None None None Some Some Some None None None Yes By roundabout category, approximately what proportion of miniroundabouts are in urban, suburban and rural areas of your state? lane roundabouts are in urban, suburban and rural areas of your state?
|
From page 62... ...
Alaska Arkansas California Connecticut Delaware Florida Georgia Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Mexico New York North Carolina North Dakota Oregon Pennsylvania Rhode Island South Dakota Texas Vermont Virginia Washington West Virginia Wisconsin Wyoming State Improved safety performance Shorter vehicular delays Higher capacity Lower initial capital costs Lower life-cycle costs Aesthetic/urban design improvements Responding to request from local jurisdiction Responding to request from elected official Lower speeds/traffic calming Other Other Note Usually Usually About half the time About half the time Usually Usually Seldom Seldom Seldom No Seldom About half the time About half the time Never About half the time About half the time Usually About half the time Seldom No About half the time Usually About half the time Seldom Never About half the time Seldom Never Seldom Yes Always About half the time Seldom Seldom About half the time About half the time About half the time About half the time Usually Yes About half the time About half the time About half the time Never Never About half the time Never Never About half the time A Don't know Usually About half the time Seldom About half the time Seldom About half the time About half the time Seldom About half the time Always B No Usually About half the time About half the time About half the time About half the time About half the time Usually About half the time About half the time Yes Usually About half the time About half the time Seldom About half the time Seldom Seldom Seldom Seldom Don't know Usually About half the time About half the time Seldom Seldom Seldom Never Never About half the time Yes Always Usually Usually Always Always About half the time Always Always Always Always C Yes Usually About half the time Usually About half the time About half the time About half the time About half the time About half the time Usually Yes Usually Usually Usually Seldom About half the time Seldom Usually Usually Usually Yes Usually Usually Usually Seldom Seldom Seldom Usually Seldom Usually Yes Usually Usually Usually Never About half the time About half the time Seldom Seldom Never Yes Always Usually Usually Usually Usually Seldom About half the time Seldom Usually Don't know Usually Usually Usually About half the time About half the time About half the time About half the time Seldom Seldom Yes Usually Usually Usually Seldom About half the time About half the time Seldom Seldom Usually Yes About half the time Usually About half the time Seldom About half the time Seldom Never About half the time No Usually Seldom About half the time Seldom About half the time About half the time About half the time About half the time Seldom Yes Always Usually Usually Seldom Usually About half the time About half the time Seldom Seldom Yes Usually Seldom Seldom Seldom Seldom Seldom Seldom Seldom Seldom Yes Usually Seldom Seldom Never Seldom Never Never Never About half the time Don't know Usually Usually Usually Seldom About half the time About half the time About half the time Seldom Usually Yes Usually Usually Usually Seldom Seldom Seldom Usually Usually Usually Don't know Usually Usually Usually Seldom Usually Usually Seldom Seldom Usually About half the time D Yes Always Usually Seldom Seldom About half the time Seldom About half the time Seldom Seldom Seldom E Yes Always Usually Usually Seldom Seldom Seldom About half the time Never Usually Don't know Usually Usually Usually Seldom Usually Usually Usually Usually Usually Yes Usually About half the time About half the time Never Seldom Never Seldom Seldom Seldom Yes Always Always Always Seldom Seldom About half the time About half the time Seldom About half the time No Always Always About half the time Never Always Never Seldom Seldom About half the time F No G Don't know Always Usually Seldom Seldom Seldom Never Never Never Usually Never Yes Always Always Always Always Always Always Always Always Always Yes Usually Usually Usually Usually Usually Usually Usually H Yes Usually Usually Usually Never About half the time Seldom Seldom Seldom No Usually Usually Usually Seldom Seldom Seldom Seldom Seldom Seldom Yes Usually Usually Seldom Never Never Never Never Never Never No Please select the frequency in which your state agency selects roundabouts based on the following set of common reasons for selecting roundabouts. A: Lower off-peak delays than a traffic signal B: FDOT directive to consider roundabouts when doing a project C: Our primary goal is improved safety.
|
From page 63... ...
Alaska Arkansas California Connecticut Delaware Florida Georgia Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Mexico New York North Carolina North Dakota Oregon Pennsylvania Rhode Island South Dakota Texas Vermont Virginia Washington West Virginia Wisconsin Wyoming State Website Flyer and/or pamphlet Video Other Other Note Our state agency has not developed public outreach material X X X X X X X X X X X X X X X X X X X X X X X X X X X A X X X X X X X X X X X X X X X X X B X X X X X X X X X X C X X X X X X X X D X X X X X X X X X X X X X X X X X X X X X X X X X X E X X X A: Public meetings with displays B: Roundabout mat (scale model) ; roundabout guidance on state highway map C: Radio and TV public-service announcements D: VISSIM simulations E: Wisconsin Motorist Handbook, TV & radio commercials, video animation, roundabout driver simulator, DVD's, state maps, Commerical Driver's Manual, newpaper articles Please indicate the types of public outreach materials that have been developed by your state agency.
|
From page 64... ...
Alaska Arkansas California Connecticut Delaware Florida Georgia Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Mexico New York North Carolina North Dakota Oregon Pennsylvania Rhode Island South Dakota Texas Vermont Virginia Washington West Virginia Wisconsin Wyoming State Presentations Charts, figures, etc... on display boards Scaled plan sets with vehicle models Attendance from agency staff Attendance from roundabout design team Attendance from "highranking" agency official Attendance from traffic engineers involved in the project Attendance from transportatio n planners involved in the project Question and answer session (town hall meeting)
|
From page 65... ...
Alaska Arkansas California Connecticut Delaware Florida Georgia Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Mexico New York North Carolina North Dakota Oregon Pennsylvania Rhode Island South Dakota Texas Vermont Virginia Washington West Virginia Wisconsin Wyoming State Mini-Roundabouts Single-Lane Roundabouts Multilane Roundabouts Yes No answer $1,500,000 $3,000,000.00 No No answer $500,000 $1,250,000.00 No No answer $1,500,000 $3,000,000.00 No No answer $1,500,000 $2,000,000.00 No No answer $2,000,000 No answer Yes $50,000 $500,000 $1,200,000.00 No $200,000 $1,200,000 $2,000,000.00 No answer No answer No answer No answer No answer No answer Yes No answer $635,000 $1,400,000.00 No No answer No answer No answer Yes No answer $2,500,000 $4,000,000.00 No No answer $100,000 $200,000.00 No No answer $1,600,000 $3,000,000.00 Yes No answer $1,300,000 $2,500,000.00 Yes $400,000 $1,000,000 $2,500,000.00 No No answer No answer No answer No No answer No answer No answer Yes $160,000 $1,050,000 $1,500,000.00 No $250,000 $2,000,000 $3,000,000.00 No $50,000 $600,000 $800,000.00 Yes No answer $2,000,000 $2,500,000.00 No No answer No answer No answer No No answer $1,500,000 $6,000,000.00 No No answer $1,000,000 $2,000,000.00 No No answer $750,000 $750,000.00 Yes $50,000 $1,000,000 $1,500,000.00 No $250,000 $600,000 $1,000,000.00 No $1,000,000 $2,000,000 No answer Yes No answer No answer No answer No No answer No answer No answer No No answer No answer No answer No No answer $1,000,000 No answer No No answer No answer No answer Yes No answer No answer No answer Yes No answer $1,500,000 $2,500,000.00 No $80,000 $1,250,000 $1,750,000.00 No No answer $400,000 $600,000.00 No No answer $100,000 $1,250,000.00 No No answer $5,000,000 No answer Does your state have state statutes, codes, or laws that regulate traffic rules at roundabouts? More specifically, does your state have state statutes, codes, or laws that are only applicable to roundabouts?
|
From page 66... ...
Alaska Arkansas California Connecticut Delaware Florida Georgia Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Mexico New York North Carolina North Dakota Oregon Pennsylvania Rhode Island South Dakota Texas Vermont Virginia Washington West Virginia Wisconsin Wyoming State HCM 2010 Model HCM 2010 Model calibrated to local conditions HCM 2010 Model calibrated to nonlocal conditions Sidra Standard Model with Environment Factor Sidra Standard Model without Environment Factor UK Equations uncalibrated UK Equations calibrated Microsimulation Other Other Note XX X X XXX X A X X X X X X X X XX X X B X X X X X X X C X XX X D XX XX X X X EXX X X X X XX X X X X X XX X F X X X X X X X XX X X X X X XX X X X X X X X X X X X X XX XX X X X X X X X X X X X X G X XXXX X H X X A: RODEL B: Synchro C: Model used depends on build year or future vs. year evaluation D: Vissim traffic simulation, Synchro SimTraffic E: Equations provided in NCHRP Report 572 F: Rodel, Arcady G: Sidra Standard with no environment factor in design year H: HCM 2010 model calibrated for statewide roundabout analysis based on observed headways What delay/capacity model is used or permitted by your state agency to determine the operational performance of a roundabout?
|
From page 67... ...
Alaska Arkansas California Connecticut Delaware Florida Georgia Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Mexico New York North Carolina North Dakota Oregon Pennsylvania Rhode Island South Dakota Texas Vermont Virginia Washington West Virginia Wisconsin Wyoming State Arcady HCS Rodel Sidra State Agency developed tool (excel spreadsheet or other, please specify) Synchro Vistro Microsimulation Other, please specify in the comments box Comments X X X X X X X X X X XXX X X X A X X XXX X X X A XX XX B X X XXX X X X X X X X X X C X X A X XXX XX X X X X X X X X X D XXX XXX XXX X XX XXXX X X X EX X XX X X FXX X X XX XX XX XXX X AX G XXX X X HXXX XXXX A: Vissim B: GDOT Roundbout Analysis tool is almost always used, so HCS is not used much since the GDOT tool uses the same formulas.
|
From page 68... ...
Alaska Arkansas California Connecticut Delaware Florida Georgia Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Mexico New York North Carolina North Dakota Oregon Pennsylvania Rhode Island South Dakota Texas Vermont Virginia Washington West Virginia Wisconsin Wyoming State Case-by-case basis 5 years 10 years 20 years Over 20 years 20 20 DC 20 20 20 modleSyllausUsemitemoSreveNX 20 20 20 E 25 15-20 20 20 reveNsemitemoSsemitemoSreveNX 20 AXsyawlAyllausU F 20 20 20 modleSyllausUmodleSmodleSX 20 XyllausU G reveNyllausUsemitemoSmodleSX XreveNsyawlAreveNreveN H 20 semitemoSyllausUmodleSmodleSX 20 X XsyawlA 30 IB modleSyllausUyllausUsyawlAX 20 20 20 How is the design year determined? A: 20 year design life; then a phased approach based on 10 year increments B: 20 years for Federal or Interstate projects C: Current year for safety & operational projects; build-out year for local development mitigation projects D: 20 years from construction for new facility or reconstruction (intersection and interchange)
|
From page 69... ...
Alaska Arkansas California Connecticut Delaware Florida Georgia Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Mexico New York North Carolina North Dakota Oregon Pennsylvania Rhode Island South Dakota Texas Vermont Virginia Washington West Virginia Wisconsin Wyoming State Highway Safety Manual predictive methodology: Crash Modification Factors or Crash Reduction Factors (uncalibrated) : Crash Modification Factors or Crash Reduction Factors (calibrated to local conditions)
|
From page 70... ...
Alaska Arkansas California Connecticut Delaware Florida Georgia Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Mexico New York North Carolina North Dakota Oregon Pennsylvania Rhode Island South Dakota Texas Vermont Virginia Washington West Virginia Wisconsin Wyoming State X A X B X X X X X C X D X E X F X G X H X X X X I X J X X K X L X M X X X N X X O X P X X X Q X R X X X S X T X U X Please indicate the extent to which your state agency uses NCHRP Report 672: Roundabouts an Informational Guide, Second Edition to provide roundabout design guidance. Our state uses NCHRP Report 672 as the only source of design guidance.
|
From page 71... ...
Alaska Arkansas California Connecticut Delaware Florida Georgia Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Mexico New York North Carolina North Dakota Oregon Pennsylvania Rhode Island South Dakota Texas Vermont Virginia Washington West Virginia Wisconsin Wyoming State Does your state agency typically try to use a phased implementation approach to multilane roundabouts? (This could include opening a roundabout with fewer entry, circulating or exit lanes than is ultimately determined to be necessary for future conditions.)
|
From page 72... ...
Alaska Arkansas California Connecticut Delaware Florida Georgia Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Mexico New York North Carolina North Dakota Oregon Pennsylvania Rhode Island South Dakota Texas Vermont Virginia Washington West Virginia Wisconsin Wyoming State Have one or more roundabouts in your state (built by your state agency or others) been modified from its original design to address safety or operational issues?
|
From page 73... ...
Alaska Arkansas California Connecticut Delaware Florida Georgia Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Mexico New York North Carolina North Dakota Oregon Pennsylvania Rhode Island South Dakota Texas Vermont Virginia Washington West Virginia Wisconsin Wyoming State Has your state developed guidance on the accommodation of large vehicles (trucks, emergency vehicles, farming equipment, oversize/overweight vehicles, etc...) at roundabouts?
|
From page 74... ...
Alaska Arkansas California Connecticut Delaware Florida Georgia Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Mexico New York North Carolina North Dakota Oregon Pennsylvania Rhode Island South Dakota Texas Vermont Virginia Washington West Virginia Wisconsin Wyoming State AASHTO Roadway Lighting Design Guide IES Design Guide for Roundabout Lighting NCHRP Report 672 State-specific standard Other Other, please specify Yes X X X X A Yes X X X Yes BX Yes X X Yes Yes XX Ye CXXXXXs Yes X X D No Yes EX Yes X Yes X F No Yes X Yes X X Yes X Yes X X GX Yes X X Yes HXX Yes X X Yes X X X Yes X Yes X X X Yes X X X I Yes X J Yes X Yes X Yes X X No Yes X K Yes X LX Yes X Yes X Yes MX Yes X X Yes X X Yes X What is the basis for your state's illumination standard/guidance? Illumination standard/guidance Does your state follow developed standards/guidance on the illumination of roundabouts?
|
From page 75... ...
Alaska Arkansas California Connecticut Delaware Florida Georgia Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Mexico New York North Carolina North Dakota Oregon Pennsylvania Rhode Island South Dakota Texas Vermont Virginia Washington West Virginia Wisconsin Wyoming State They are not part of design standards used by our agency Not sure they work efficiently Not sure they are safe Not sure that the drivers will get used to them Concerned about liability issues Other Other, please explain Is your agency considering the construction of roundabouts? X X A Yes What are the major reasons why your agency has not built roundabouts on the state system?
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.