Why are school and school crosswalk signs made fluorescent yellow-green rather than ordinary yellow? · Q-0004

Why are school and school crosswalk signs made fluorescent yellow-green rather than ordinary yellow?

1. a Because the colour means the sign applies to cyclists only
2. b So they stand out from ordinary warning signs
3. c Because the colour marks signs that apply only on weekends
4. d Because fluorescent signs are the only ones that are legally enforceable

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