Show traffic on google maps2/29/2024 ![]() How our speed limit data is powering future driving technologies If the partner has photos available, we use a combination of AI and help from our operations team to identify the sign in the images, extract the new speed limit information, and update Google Maps. In areas where we don’t have recent Street View imagery available, we request images of the specific stretch from third-party partners that already gather roadway information to do things like improve delivery routes and road safety. If we suspect the speed limit in an area has been updated, we cross-reference the change with multiple sources - like official data from local governments and refreshed Street View imagery - to confirm or deny the change. This can happen if a new school is built or if a local government determines that a road is a high-risk area for accidents. For example, if our trends show cars are consistently traveling below the speed limit, it might be an indication that the speed limit has decreased. To tackle this problem, Google Maps analyzes traffic trends to understand if there could be a speed limit change. Things like construction, community input and long-term traffic conditions may temporarily or permanently change the speed limit. However, speed limits are constantly changing, which makes them challenging to update. Imagery and data provide a solid foundation for our model of real-world speed limits. How traffic patterns keep speed limits updated To capture all of these nuances within Google Maps, we use imagery and AI. Still, there are a lot of roads that have different speed limits during different times or weather conditions. For example, in California, 25 miles per hour is the default speed limit in residential areas. One important source is authoritative data from local governments that helps us know what the default speed limits are for different types of roads when there is no signage. To map the world, we rely on data from many sources the same is true for how we understand speed limits. How AI helps identify speed limits around the world Here’s a look at how we use AI and imagery to identify speed limits, and how we use speed limits to build more helpful products. This information not only helps drivers stay safe, but also helps automakers as they work to enhance assisted driving capabilities in cars. To help drivers navigate, Google Maps displays speed limit information for streets around the world. For example, you might be driving in low-visibility conditions like on a foggy day, in a different area with unfamiliar traffic laws, or simply not know what the speed limit is at a particular moment. Speed limits play an important role in making roads safer for everyone, but sometimes it can be hard for drivers to know what the speed limit is.
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