Proposal for Amendments to Regulations 6,7 and 48
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Proposal for Amendments to Regulations 6,7 and 48

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Proposal for Amendments to Regulations 6,7 and 48

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Proposal for amendments to regulations 6 7 and 48

Proposal for Amendments to Regulations 6,7 and 48

The diagrams reproduced below were prepared by the expert from the Working Party “Brussels 1952” (GTB) to provide supporting information in relation to the proposals to introduce, into regulation Nos. 6,7 and 48, provisions for reduced inboard geometric visibility below the horizontal plane for rear direction indicator, rear position lamp and stop lamp.

This supporting information applies to documents: ECE/TRANS/WP29/GRE/2010/29, ECE/TRANS/WP29/GRE/2010/31 and ECE/TRANS/WP29/GRE/2010/36.


Specifications legend

specifications / legend

  • Width of rear lamps:1.4 m

  • Height of rear lamps:< 0.75 m

  • Width of lanes:2.0 m

  • Measuring grids:1 and 3 m (distance)1.2 m (height, different widths)

  • Used light distribution:stop lamp (complete geometric visibility)

  • other geometry:reference axis(white)line 15° up(purple)line 5° down(purple)line 15° down(purple)line 20° inboard(green)line 45° inboard(green)

  • Distance markings:1, 3, 5 and 10 m (relating to rear lamps)


Vehicle and road geometry birds eye view

1m

3m

5m

10m

vehicle and road geometry birds-eye view

+15°vertikal

45°inboard

-15°vertikal

20°inboard

reference

axis

-5°vertikal


Vehicle and road geometry side view

1m

3m

5m

10m

vehicle and road geometry - side view

+15°vertikal

reference

axis

-5°vertikal

-15°vertikal


Vehicle and road geometry top view

1m

3m

5m

10m

vehicle and road geometry - top view

45°inboard

20°inboard

reference

axis


Dark zone resulting from actual inboard geometric visibility 45

1m

3m

5m

10m

‘dark zone’resulting from actual inboard geometric visibility (45°)

+15°vertikal

45°inboard

-15°vertikal

20°inboard

reference

axis

-5°vertikal


Dark zone resulting from proposed inboard geometric visibility

1m

3m

5m

10m

‘dark zone’resulting from proposed inboard geometric visibility

Reduce visibility angle to 20° inboard below the H plane (when mounted below 750 mm)

45°inboard

20°inboard

reference

axis

45°inboard

20°inboard


Light intensity distribution 1 m grid influence of proposed reduction on visibility

1m

1m

3m

3m

5m

5m

10m

10m

light intensity distribution (1 m grid) –influence of proposed reduction on visibility

left rear lamp

right rear lamp

Light intensity distribution of the left and right mounted lamps plotted on a vertical plane located at 1m distance


Light intensity distribution 1 m grid influence of proposed reduction on visibility cont d

1m

3m

5m

10m

light intensity distribution (1 m grid) –influence of proposed reduction on visibility (cont’d)

Light intensity distribution of the left and right mounted lamps plotted on a vertical plane located at 1 m distance. There is a dark area between the two lamps where no light is perceptible.


Light intensity distribution 1 m grid influence of proposed reduction on visibility cont d1

1m

3m

5m

10m

light intensity distribution (1 m grid) –influence of proposed reduction on visibility (cont’d)

Proposed reduction of inboard geometric visibility below the H plane does not compromise the required light distribution in space of the relevant function!


Light intensity distribution 3 m grid influence of proposed reduction on visibility

1m

1m

3m

3m

5m

5m

10m

10m

light intensity distribution (3 m grid) –influence of proposed reduction on visibility

left rear lamp

right rear lamp

Light intensity distribution of the left and right mounted lamps plotted on a vertical plane located at 3m distance


Light intensity distribution 3 m grid influence of proposed reduction on visibility cont d

1m

3m

5m

10m

light intensity distribution (3 m grid) –influence of proposed reduction on visibility (cont’d)

Light intensity distribution of the left and right mounted lamps plotted on the vertical plane located at 3 m distance. In the whole area an observer would perceive light from at least one rear lamp.


Light intensity distribution 3 m grid influence of proposed reduction on visibility cont d1

1m

3m

5m

10m

light intensity distribution (3 m grid) –influence of proposed reduction on visibility (cont’d)

Influence of reduced inboard visibility angle – only minimal effect on the light perceived by the observer.


Light intensity distribution 3 m grid influence of proposed reduction on visibility cont d2

light intensity distribution (3 m grid) –influence of proposed reduction on visibility (cont’d)

inboard visibility angle ‘– 45°’

reduced inboard visibility angle ‘– 20°’

700 mm

ground

The noticeable variation of perceived light intensity distribution is only noticeable below the H plane (approx. up to 40 cm above the ground)


Comparison of reduced inboard visibility to reduced downward visibility

1m

3m

5m

10m

comparison of reduced inboard visibility to reduced downward visibility

-5°vertikal

reference

axis

Reduction of downward visibility restricted to mounting height less than 750 mm


Only small difference between reduced downward and inboard visibility

only small difference betweenreduced downward and inboard visibility


Proposal for reduced inboard geometric visibility conclusions

proposal for reduced inboard geometric visibility– conclusions

  • Reduction of inboard visibility angle to 20° below the H plane will increase the resulting ‘dark zone’ by approximately 1.2 m ( from 0.72m to 1.92m).

    • Taking into account, that only inside a ‘small’ triangle behind the car and under the H plane the visibility of the rear lamps will be less perceptible, and assuming a typical hood of a (following) car with a length of at least 1.2 m minimum, the eyes of any following driver will not perceive any visibility reduction.

  • At a distance of 3 m behind a vehicle, the combined light distribution of the left and right mounted lamps shows only minor effect due to a reduced inboard visibility angle

    • There is an insignificant reduction of the light intensity distribution below the H plane (approx. up to 40 cm above the ground – at 3 m distance

  • Reduction of downward visibility angle to 5° (already current practice when mounted below 750 mm) has almost the same impact as the proposed reduction of inboard visibility angle to 20°

    • The proposed reduced in inboard geometric visibility is based upon this same 750mm mounting height.

  • No negative safety implications are expected from the reduction of the inboard geometric visibility angle from 45° to 20° below the H plane.


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