Message signs and arrow boards are used to direct traffic and safeguard workers on roads and highways. These devices were originally run by dieselpowered generators.Which of the following provides a practical way to power these mobile devices and is more efficient than a generator?
A)natural gas
B)water power
C)a geothermal system
D)a solar conversion system

Question

Quizplus · Accepted Answer

A solar conversion system is more efficient and practical for powering mobile devices like message signs and arrow boards on roads and highways. Solar panels can convert sunlight into electricity, providing a sustainable and low-maintenance power source that does not require fuel and produces no emissions, unlike diesel-powered generators.

Message Signs and Arrow Boards Are Used to Direct Traffic