Which data source do map apps primarily rely on to determine fastest routes?

• A. Satellite data
• B. User reviews
• C. Forecast data
• D. Network latency measurements

Answer: (A)

Fastest-route decisions come from real-time traffic data. Map apps build a model of the road network where each road segment has an estimated travel time that can change as conditions change. This estimate comes from live information such as speeds reported by road sensors, cameras, and the anonymous location data from many users’ devices as they drive, along with historical patterns and known incidents. The routing algorithm uses these dynamic edge costs to find the path that minimizes total travel time.

Satellite imagery is used for map visuals and sometimes for situational awareness, but it doesn’t provide the current speed or congestion data needed to optimize routes. Forecast data, while useful for weather-related considerations, isn’t the primary source for real-time travel times. User reviews aren’t timely or reliable for routing, and network latency measurements relate to computer networks rather than road conditions.