Read the text below. For questions (28 – 32) choose the correct answer.
Why Does Red Mean Stop?
The 19th-century Scottish engineer Robert Stevenson, who was active in designing early lighthouses, (\(28\)) for an alternative colour to white — most lighthouses had a white beacon — when he built a lighthouse near to one that already existed, because he was afraid ships wouldn’t be able to tell which was which.
Of the light sources and (\(29\)) glasses available at the time, he found that red was a particularly intense light, meaning it could (\(30\)) from the greatest distance.
So, in maritime signalling red became an alternative to white, and was later adopted by the Admiralty in 1852 (\(31\)) the port-side on steam vessels. Green was adopted for the starboard-side, and vessels seeing the green light on (\(32\)) ships had the right of way.
When train tracks were developed, engineers adopted this system as meaning stop and go — and the same system continued to be used with cars.
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