![]() Managed lane dedicated primarily to buses C. Bus Only lane (BOL), busway, or transitway b Bullnose may include or exclude curb and gutter. Location where edge of highway and edge of ramp meet each other. BulbingĪ widened portion of the median or outer separation, usually at an intersection. Building LineĪ line prescribing the nearest limits for the erection of buildings in relation to a roadway. Broken Back CurveĪn arrangement of curves in which a short tangent separates two curves in the same direction. Bridge RailingĪ longitudinal barrier whose primary function is to prevent an errant vehicle from going over the side of the bridge structure. BreakawayĪ design feature that allows a device such as a sign, luminaire or traffic signal support to yield or separate upon impact. The outer extremity of the shoulder where the side slope begins. The distance travelled from the instant that braking begins to the instant the vehicle comes to a stop. The time that elapses from the instant the driver decides to take remedial action, to the instant that remedial action begins (contacts brake pedal). It also provides an area for snow storage. It is a suitable location for underground utilities and may be used for illumination poles. It provides some protection to the pedestrian and can accommodate street accessories such as traffic signs the fire hydrants. Boulevard aĪ reserve which separates the roadway and sidewalk. The area adjoining the outer edge of the sidewalk. BikewayĪ roadway, or part of a roadway, intended for the use of bicycles, either exclusively or shared with other vehicular traffic or pedestrians. Bike RouteĪny roadway signed specifically to encourage bicycle use. Bike PathĪ bicycle facility physically separated from roadways, where motor vehicle traffic, except maintenance vehicles, is excluded. Bike LaneĪ lane intended for the exclusive use of bicycles, within a roadway used by motorized vehicles. The point or area at which a roadway divides into two branches or parts. Barrier WarrantĪ criterion that identifies a potential need for a traffic barrier. Barrier TransitionĪ method by which a change in longitudinal barrier type provides continuous protection to adjacent traffic. It is intended to contain or redirect an errant design vehicle of a particular size range, at a given speed and angle of impact. Barrier System bĪ system which provides a physical limitation through which an errant vehicle would not normally penetrate or vault over. It is intended to contain or redirect an errant vehicle of a particular size range, at a given speed and angle of impact. Barrier bĪ device which provides a physical limitation through which a vehicle would not normally pass. Where the roadway is in cut, the slope between the drainage channel and the natural ground is referred to as a back slope. The total volume of traffic during a given time period (in whole days) greater than one day and less than one year divided by the number of days in that time period. The total volume of traffic passing a point or segment of a roadway, in both directions for one year, divided by the number of days in the year. Auxiliary Lane aĪ lane in addition to, and placed adjacent to, a through lane intended for a specific maneuver such as turning, merging, diverging, weaving, and for slow vehicles, but not parking. Assured Passing Opportunity bĪ condition in which a vehicle can safely pass another without restriction either by visibility or opposing traffic. The assumed speed for calculating minimum stopping sight distance is based on the 85th percentile wet weather speeds as derived from a traffic study. Arterial RoadĪ road primarily for through traffic. Area of ContentsĪn object or roadside condition that may warrant safety treatment. Area of Concern bĪn area within the roadside environment and within the desirable clear zone that has a higher severity index than a barrier system. The taper required in advance of an intersection to shift the through lanes laterally to the right to provide the width for a left-turn auxiliary lane. The end of a median or island that faces approaching traffic. The part of the roadway, between the travel lanes and the curb or pavement edge. This change in cross-slope is accomplished over the tangent runout. See “Collision” Adverse Crown aĪ section with the cross-slope removed to a zero slope. The management of the location and basic dimensions of access to property, from a roadway. ZĪn auxiliary lane to enable a vehicle entering a roadway to increase speed to merge with through traffic as applied at channelized intersections, or as a speed-change lane at interchanges. A - These definitions are modified from the Glossary of TAC Geometric Design Guide for Canadian Roads - June 2017.ī - These definitions are in addition to the Glossary of TAC Geometric Design Guide for Canadian Roads - June 2017.
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