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Concept of the exclusion of the blind area

Informal document GRSG-104-46 (104th session, 15-19 April 2013 agenda item 5). Submitted by the expert from Japan. In Japan, it is predicted that, among accidents recorded during 8 years in the 1990s, five fatal accidents occurred at the time of the vehicle’s start due to a blind area.

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Concept of the exclusion of the blind area

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  1. Informal documentGRSG-104-46 (104th session, 15-19 April 2013 agenda item 5) Submitted by the expert from Japan In Japan, it is predicted that, among accidents recorded during 8 years in the 1990s, five fatal accidents occurred at the time of the vehicle’s start due to a blind area. In all these five accidents, the vehicle part causing damage to the victim was the left rear wheel (on the passenger’s side). Hence, we propose to specify the field of vision such that the driver, when starting the vehicle, can notice the object and stop the vehicle before it comes in contact with the rear wheel even if there is some blind area. Based on the result of an experiment using the actual vehicle driven by a general driver, we determined the blind area, X, and the distance from when the object appearing from the blind area is noticed to when the vehicle is stopped, Ls, as follows: X=0.292Ls-0.203 In order to prevent the object from being involved in an accident, Ls should be shorter than the distance from the rearmost edge of the blind area to the edge of the rear wheel, L, and the blind area, X, needs to be set with L > Ls. Concept of the exclusion of the blind area

  2. Experimental method Conducted by JARI(Japan Automobile Research Institute) Participant; 14 males, 16 females (20-60 year-old) Experiment condition; Width of blind area 0, 0.2, 0.4, 0.6, 0.8m Measurement; V(ms); Speed when driver recognize the obstacle Ls(m);Distance from when the object appearing from the blind area to when the vehicle is stopped; Blind area generated by A pillar and a door mirror Width of blind area; X(m) Experimental condition 0, 0.2, 0.4, 0.6, 0.8m) Speed when driver recognize the obstacle; V(m/s) Distance from when the object appearing from the blind area to when the vehicle is stopped; Ls(m) Distance from when the object appearing from the blind area to rear tire ; L(m) Obstacle (Height ;1m, φ;0.3m）　 Vehicle used in this experiment

  3. Experimental results Speed when driver recognize the obstacle; V(m/s) X=0.292Ls-0.203 Width of blind area; X(m) Distance when driver recognize the object appearing from the blind area to when the vehicle is stopped, Ls(m) Acceptable blind area width Distance when driver recognize the object appearing from the blind area to when the vehicle is stopped, Ls(m) Speed when driver recognize the obstacle; V(m/s) Width of blind area; X(m)

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