Traffic data availability and colors
Where traffic data is available, Google Maps can help you identify which route to choose and how much time your trip might take based on current traffic conditions. To do this, live and historic data is refreshed regularly to provide you with accurate and timely estimates. Traffic data is available in more than 600 areas in over 50 countries.
See this interactive map of current coverage for traffic data.
The colors indicate the speed of traffic on the road compared to free-flowing conditions. For highways, green means there is a normal speed of traffic. The more red the roads become, the slower the speed of traffic on the road. Gray indicates there is no data available.