Why should flaggers be stationed far ahead of heavy trucks?

Answer: B — To allow heavy trucks time to stop safely.

Heavy trucks have a lot of momentum and require more distance to react and brake. Placing flaggers far ahead gives drivers an early, clear warning and enough time to slow down gradually before reaching the work zone. This helps prevent sudden braking, reduces the risk of a rear-end or other crash, and allows the truck to approach the area safely. The lead distance should be adjusted for speed, grade, and road conditions, with longer distances needed for higher speeds or poorer conditions. Setting the warning too close defeats the purpose, and extending the lead distance for safety keeps traffic predictable and reduces surprises for drivers and flaggers alike.