Choose the fixed corridor.
RoadAheadNow uses the same curated route and checkpoint order as the live weather checker. It does not invent an alternate route.
ARRIVE BY A SPECIFIC TIME
Work backward from the arrival that matters.
Choose a curated corridor, enter the local arrival time at your destination and turn that target into an approximate departure — then check the weather on that exact plan.
WHY THIS HELPS
Arrival deadlines change which forecast matters.
A route forecast is more useful when it is aligned to the hour you expect to reach the mountain pass, city or state-line section — not simply the hour you start planning.
Resolve the destination clock.
Your target is interpreted in the destination’s local time zone. DST gaps are rejected; repeated hours stay explicit.
Subtract baseline + stops.
The result is a planning departure, not a live ETA. Traffic and road closures are intentionally not fabricated.
Check weather on that departure.
The handoff opens the existing four-window checker with the exact calculated departure instant.
Is this a live traffic ETA?
No. The planner works backward from the selected corridor’s rounded driving baseline plus the stop allowance you enter. Congestion, crashes, closures and unscheduled stops are not measured or added.
Which time zone should I use for the arrival time?
Enter the clock time you want at the destination. The planner uses the destination checkpoint’s IANA time zone and shows the resulting departure in the start location’s time zone.
What happens during a daylight-saving clock change?
A local time that does not exist is rejected. If the destination clock repeats an hour in autumn, the planner shows an earlier/later occurrence choice instead of silently guessing.
Does the weather check use the calculated departure?
Yes. The Check departure weather button passes the exact UTC departure instant, direction, vehicle profile and stop allowance into the existing four-window route checker.
Does this confirm the road will be open when I get there?
No. The result is a timing estimate. Road access, closures and restrictions still require the official state road sources for the corridor.