Roundabouts: An Informational Guide – Second Edition (2010) / Chapter Skim
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Pages 331-341
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Glossary Page 1 Roundabouts: An Informational Guide GLOSSARY 85th-percentile speed -- a speed value obtained from a set of field-measured speeds where only 15% of the observed speeds are greater (source: HCM)
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Roundabouts: An Informational Guide Page 2 Glossary approach width -- the width of the roadway used by approaching traffic upstream of any changes in width associated with the roundabout. The approach width is typically no more than half the total roadway width.
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Glossary Page 3 Roundabouts: An Informational Guide safe and orderly movements of both vehicles and pedestrians (source: AASHTO Green Book)
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Roundabouts: An Informational Guide Page 4 Glossary curb extension -- the construction of curbing such that the width of a street is reduced. Often used to provide space for parking or a bus stop or to reduce pedestrian crossing distances.
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Glossary Page 5 Roundabouts: An Informational Guide E entering traffic -- vehicles located on a roundabout entrance. entering volume -- the total volume in a given period of time on an entrance to a roundabout.
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Roundabouts: An Informational Guide Page 6 Glossary flow, demand -- see demand flow. flow, entry -- see entering volume.
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Glossary Page 7 Roundabouts: An Informational Guide K KABCO -- a severity scale used by the investigating police officer on the scene to classify injury severity for occupants with five categories: K, killed; A, disabling injury; B, evident injury; C, possible injury; O, no apparent injury. These definitions may vary slightly for different police agencies.
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Roundabouts: An Informational Guide Page 8 Glossary multilane roundabout -- a roundabout that has at least one entry with two or more lanes, and a circulatory roadway that can accommodate more than one vehicle traveling side-by-side. MUTCD -- Manual on Uniform Traffic Control Devices.
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Glossary Page 9 Roundabouts: An Informational Guide R radius, circulating path -- see circulating path radius. radius, entry -- see entry radius.
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Roundabouts: An Informational Guide Page 10 Glossary hour under specific assumed conditions. See also maximum service volume.
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Glossary Page 11 Roundabouts: An Informational Guide traffic, entering -- see entering traffic. truck apron -- see apron.
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