Answer :
Final answer:
A diamond-shaped sign is used to alert drivers to potential road hazards, such as a slippery road. Other sign shapes denote different alerts, like stop signs or railroad crossings.
Explanation:
A diamond-shaped sign is used to warn drivers of potential road hazards. In the options provided, the answer is b) Slippery road. Diamond-shaped signs are typically warning signs used to alert drivers of a change in driving conditions or the presence of potential hazards. Other shapes like an octagon is for stop signs, rectangle for regulatory information, and circles or 'X' shapes typically denote a railroad crossing.
A traffic signal would indeed improve pedestrian safety and vehicle speed control at intersections, as discussed in the reference information. Traffic engineers also carefully consider the duration of yellow lights to ensure safe stopping distances and clear the 'no-win' zone at intersections.
