You are not allowed to park within feet of any flashing signal, stop sign, or traffic signal.
30
20
15
10

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The correct answer is - 30 feet.

Explanation:

According to the parking laws one should not park within 30 feet of any flashing signal, stop sign, or traffic signal it is not allowed. Parking is also not allowed in case of the following situations -

On crosswalks

In front of driveways

double parking

On sidewalks.  

at "No Parking" signs are posted.

Within intersections or 20 feet of an intersection.

Within 15 feet of a fire hydrant.

30 ft

Explanation:

You are not allowed to park within 30 feet of any flashing signal, stop sign, or traffic signal.

you have to draw the persons position over there

no. dot product   =0 when vecs at right angles