Answer: Measure of each angle on the sign is 128.6° .
Step-by-step explanation:
Since we have given that
A road sign is in the shape of a regular heptagon.
As we know that "Sum of exterior angles is always 360°":
And there is 7 sides in a regular heptagon.
So, Measure of each exterior angle is given by

so, we know that "Sum of exterior angle and interior angle is supplementary."

Hence, Measure of each angle on the sign is 128.6° .