Assured clear distance ahead
In legal terminology, the assured clear distance ahead (ACDA) is the distance ahead of any terrestrial locomotive device such as a land vehicle, typically an automobile, or watercraft, within which they should be able to bring the device to a halt. It is one of the most fundamental principles governing ordinary care and the duty of care for all methods of conveyance, and is frequently used to determine if a driver is in proper control and is a nearly universally implicit consideration in vehicular accident liability. The rule is a precautionary trivial burden required to avert the great probable gravity of precious life loss and momentous damage. Satisfying the ACDA rule is necessary but not sufficient to comply with the more generalized basic speed law, and accordingly, it may be used as
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ACDAAdvisory speed limitAggressive drivingAssured Clear Distance AheadAssured clear distance aheadAutomotive safetyBraking distanceCycling infrastructureDefensive drivingDesign speedGeometric design of roadsHeadlampIntelligent speed adaptationInternational Regulations for Preventing Collisions at SeaMoving violationNational cycling route networkOperating speedRed light cameraRoad slipperinessSelf-driving carSolomon curveSpeed limitStop signStopping sight distanceTailgatingTraffic calmingTraffic collisionTraffic collision reconstructionTwo-second ruleVehicular automationWhite-tailed deer
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Assured clear distance ahead
In legal terminology, the assured clear distance ahead (ACDA) is the distance ahead of any terrestrial locomotive device such as a land vehicle, typically an automobile, or watercraft, within which they should be able to bring the device to a halt. It is one of the most fundamental principles governing ordinary care and the duty of care for all methods of conveyance, and is frequently used to determine if a driver is in proper control and is a nearly universally implicit consideration in vehicular accident liability. The rule is a precautionary trivial burden required to avert the great probable gravity of precious life loss and momentous damage. Satisfying the ACDA rule is necessary but not sufficient to comply with the more generalized basic speed law, and accordingly, it may be used as
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In legal terminology, the assu ...... s by staying clear of roadway.
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For an onlooker without assistance of lateral movement.
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For an onlooker without assistance of looming movement.
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Head-on Car Speed vs. Detection Distance of Looming Motion
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Lateral Car Speed vs. Detection Distance of Lateral Motion
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Permitted by good tires and clean, dry, level, pavement.
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Prima Facie Maximum Speed vs. "Line-of-Sight" Distance
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Chart|xAxisTitle=Assured Clear ...... ,67.0,71.3,75.6,80.0,84.4,88.7
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November 2017
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As a vehicle creeps into an in ...... ting they are both observable.
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Visual Limits of Drivers Entering Intersection from a Stop.
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Chart|xAxisTitle=Lateral Car S ...... ion distance of lateral motion
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Chart|xAxisTitle=Oncoming Car ...... ion distance of looming motion
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Derivation of ACDA 1
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Derivation of ACDA 2
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Derivation of ACDA 3
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Derivation of ACDA 4
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Derivation of ACDA 5
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Derivation of Seconds of distance to stop rule
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Table of ACDA: forward line-of-sight
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Table of ACDA: horizontal line-of-sight
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Table of ACDA: intersectional setback
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Table of acceleration values
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In legal terminology, the assu ...... ccordingly, it may be used as
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Assured clear distance ahead
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