Which three colours are banned in the Rail Corridor?

Which three colours are banned in the Rail Corridor?

• A. Red, Yellow, Blue
• B. Red, Yellow, Green
• C. Red, Blue, Green
• D. Yellow, Green, Blue

Answer: (B)

The main idea here is preventing misinterpretation of signals in the rail environment. Red, yellow, and green are the colours most strongly tied to railway signal meanings—red means stop, yellow signals caution or prepare to stop, and green means go. If these colours appear on signage, clothing, or equipment outside the official signaling system, they could be mistaken for actual train instructions, which could lead to unsafe actions. To keep messaging clear and reduce confusion on the rail corridor, those colours are restricted. That’s why red, yellow, and green are the banned combination. The other color sets don’t carry the same direct signal associations, so they don’t pose the same risk of misreading, which is why they aren’t banned.

The main idea here is preventing misinterpretation of signals in the rail environment. Red, yellow, and green are the colours most strongly tied to railway signal meanings—red means stop, yellow signals caution or prepare to stop, and green means go. If these colours appear on signage, clothing, or equipment outside the official signaling system, they could be mistaken for actual train instructions, which could lead to unsafe actions. To keep messaging clear and reduce confusion on the rail corridor, those colours are restricted. That’s why red, yellow, and green are the banned combination. The other color sets don’t carry the same direct signal associations, so they don’t pose the same risk of misreading, which is why they aren’t banned.