A town tested a phone alert for temporary road closures. The first alerts named the road but gave no reopening estimate, so drivers found them ① incomplete. Officials then added the expected duration and a suggested detour. This made the alerts more ② useful for planning, although the estimate could still change. To avoid false certainty, each message marked the estimate as ③ provisional. Drivers could therefore compare routes without treating the time as a ④ guarantee. The revision made uncertainty more ⑤ invisible rather than helping readers judge it.