The primary job of the FBD is to emphasize ordinary warning signs:
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| W1-2R | W6-3 | W12-2 |
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The FBD is appropriate even when the sign gives advance warning of stopping or yielding:
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| W3-1a | W3-2a | W10-1 | W3-3 | W3-H6 |
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The FBD can also be used with green school signs (MUTCD 7B), orange road construction signs (MUTCD 6F.02) and pink incident management (MUTCD 6I) signs:
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| S1-1 | W22-1 | W4-2 |
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