Final answer:
The correct answer to where you should never park a vehicle is d) all of the above, which includes in front of driveways, close to crosswalks, and near flashing signals for safety reasons.
Step-by-step explanation:
You should never park a vehicle a) in front of a public or private driveway, b) within 20 feet of a crosswalk, c) within 30 feet of any flashing signal located at the side of the roadway, d) all of the above. These rules are put in place to ensure the safety of both drivers and pedestrians, maintaining clear visibility and access. Blocking driveways impedes property access, parking too close to a crosswalk reduces pedestrian safety, and parking near flashing signals can obscure important traffic controls and signage. Hence, the correct answer to this question is d) all of the above.