Load and trailer

At the Hornbach you load wide garden fence panels onto the back seat and boot, while the day's last sunbeams shine through the rear window. What must remain visible or usable? (multiple answers possible)

Only the rear lights; the plate may be partly covered
The licence plate front and rear (clearly readable)
The lights and retroreflectors (not covered)
The view out through the mirrors (unobstructed)

Explanation

False — trap: partly feels like enough. Book p.203: the plate too must stay clearly readable and not screened off — not 'partly covered'.

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