What Do Red and Yellow Colors Mean in Navigation?

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In navigation systems, dark red indicates severe traffic congestion, red represents congestion, yellow signifies slow-moving traffic, green denotes smooth traffic flow, solid blue lines indicate roads with no traffic information, dashed blue lines represent internal roads (including non-navigable routes), and gray dashed lines mark roads inaccessible to vehicles. Additional information: An automotive navigation system primarily consists of a navigation host unit and a display terminal. The built-in GPS antenna receives data signals from at least three of the 24 GPS satellites orbiting Earth, enabling it to determine the vehicle's current position. By matching the coordinates obtained from GPS satellite signals with digital map data, the navigation host can pinpoint the vehicle's exact location on the electronic map.