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Early _______ signs, pavement _________, _______, and flashing ____ lights are used at railroad crossings.

User Zaphood
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Final answer:

The subject of this question is Social Studies as it pertains to transportation and pedestrian safety.

Step-by-step explanation:

The subject of this question is Social Studies as it pertains to transportation and pedestrian safety. Using traffic signals and other safety measures at railroad crossings is an important topic within Social Studies.

User Jeff Steil
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