T12), also called the Kose–Jägala highway (Estonian: Kose–Jägala maantee), is a 36.1-kilometre-long[1] national basic road in northern Estonia.

The highway begins at Kose on national road 2 and ends at Jägala on national road 13.

[2] T12 is located entirely in Harju County and it passes through the following municipalities:[2]

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