Remote Estimation of Free-Flow Speeds

Weilian Song, Tawfiq Salem, Hunter Blanton, Nathan Jacobs

Research output: Working paperPreprint


We propose an automated method to estimate a road segment's free-flow speed from overhead imagery and road metadata. The free-flow speed of a road segment is the average observed vehicle speed in ideal conditions, without congestion or adverse weather. Standard practice for estimating free-flow speeds depends on several road attributes, including grade, curve, and width of the right of way. Unfortunately, many of these fine-grained labels are not always readily available and are costly to manually annotate. To compensate, our model uses a small, easy to obtain subset of road features along with aerial imagery to directly estimate free-flow speed with a deep convolutional neural network (CNN). We evaluate our approach on a large dataset, and demonstrate that using imagery alone performs nearly as well as the road features and that the combination of imagery with road features leads to the highest accuracy.
Original languageUndefined/Unknown
StatePublished - Jun 24 2019

Bibliographical note

4 pages, 4 figures, IGARSS 2019 camera-ready submission


  • cs.CV


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