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§ 29.1391
Minimum intensities in the horizontal plane of forward and rear position lights.
Each position light intensity must equal or exceed the applicable values in the following table:
Dihedral angle (light included)
Angle from right or left of longitudinal axis, measured from dead ahead
Intensity (candles)
L and R (forward red and green)
0° to 10°10° to 20° 20° to 110°
4030 5
A (rear white)
110° to 180°