Document ID: chunk:federal_register_of_legislation:F2023C00919:body:0:p86
Version: federal_register_of_legislation:F2023C00919
Segment Type: other
Provision Reference: 
Character Range: 253018–256263

shall, to the satisfaction of the Type Approval Authority, perform a visual test to verify that there is no direct visibility of the apparent surface of the exterior courtesy lamps, if viewed by an observer moving on the boundary of a zone on a transverse plane 10 m from the front of the vehicle, a transverse plane 10 m from the rear of the vehicle , and two longitudinal planes 10 m from each side of the vehicle; these four planes to extend from 1 m to 3 m above and perpendicular to the ground as shown in Annex 14.
At the request of the applicant and with the consent of the Technical Service this requirement may be verified by a drawing or simulation.
6.25.                                Rear-end collision alert signal
6.25.1.                          Presence
Optional
The rear-end collision alert signal shall be given by the simultaneous operation of all the direction indicator lamps fitted as described in paragraph 6.25.7.
6.25.2.                          Number
As specified in paragraph 6.5.2.
6.25.3.                          Arrangement
As specified in paragraph 6.5.3.
6.25.4.                          Position
As specified in paragraph 6.5.4.
6.25.5.                          Geometric visibility
As specified in paragraph 6.5.5.
6.25.6.                          Orientation
As specified in paragraph 6.5.6.
6.25.7.                          Electrical connections. Compliance with these requirements shall be demonstrated by the applicant, by simulation or other means of verification accepted by the Technical Service responsible for type approval.
6.25.7.1.                    All the lamps of the rear-end collision alert signal shall flash in phase at a frequency of 4.0 +/- 1.0 Hz.
6.25.7.1.1.              However, if any of the lamps of the rear end collision alert signal to the rear of the vehicle use filament light sources the frequency shall be 4.0 +0.0/-1.0 Hz.
6.25.7.2.                    The rear-end collision alert signal shall operate independently of other lamps.
6.25.7.3.                    The rear-end collision alert signal shall be activated and deactivated automatically.
6.25.7.4.                    The rear-end collision alert signal shall not be activated if the direction indicator lamps, the hazard warning signal or the emergency stop signal is activated.
6.25.7.5.                    The rear-end collision alert signal may only be activated under the following conditions:
Vr             activation
Vr > 30 km/h   TTC  1.4
Vr  30 km/h   TTC  1.4 / 30 ×Vr

"Vr (Relative Speed)": means the difference in speed between a vehicle with rear-end collision alert signal and a following vehicle in the same lane.
"TTC (Time to collision)": means the estimated time for a vehicle with rear-end collision alert signal and a following vehicle to collide assuming the relative speed at the time of estimation remains constant.
6.25.7.6.                    The activation period of the rear-end collision alert signal shall be not more than 3 seconds.
6.25.8.                          Tell-tale
Optional
6.26.                                Manoeuvring lamps (Regulation No. 23)
6.26.1.                          Presence
Optional on motor vehicles.
6.26.2.                          Number
One or