Route 10 begins at an incomplete interchange with Route 12 (Park Avenue) on the Cranston-Providence border. The bridge that carries Route 12 over Route 10 has enough space for a four-lane freeway underneath, but only the ramp from Route 12 east to Route 10 north passes under it. Until around 2000, the ramp from Route 10 south to Route 12 east instead passed under the bridge; that movement is now made with a left turn onto Route 12. There were once plans to extend Route 10 south, in conjunction with an eastern extension of the Route 37 freeway.