How DriveWindow turns forecasts into route planning context

1. Representative route points

For published route pages, DriveWindow selects named points that represent the start, destination, and meaningful intermediate sections such as mountain passes, coastal crossings, desert stretches, or major corridor cities. These points are documented on each route page.

2. Weather observations and forecasts

The website requests hourly temperature, precipitation probability, precipitation, snowfall, weather codes, wind gusts, and visibility. Units follow the page market: imperial for the US experience and metric for Canada, French Canada, and Spanish pages.

3. Route risk signal

Each sampled point receives a low, moderate, high, or very high signal. The current corridor signal uses the most restrictive point so that a difficult segment is not hidden by easier weather elsewhere on the route.

• Precipitation probability and snowfall increase wet or winter risk.
• Strong wind gusts matter more on exposed roads, bridges, deserts, and for high-profile vehicles.
• Low visibility can raise the signal even when precipitation totals are small.
• Freezing temperatures combined with precipitation receive additional weight.

4. Limits and responsible use

A sampled forecast cannot represent every mile or guarantee road safety. Local terrain, road treatment, construction, traffic, incidents, wildfire, and rapidly changing storms may produce conditions different from the forecast. Always use official warnings and road-authority information for decisions that affect safety.