Tenant Asking for a Speed Bump

[Suzette T.]

Hello! We have tenants on a private road. Some of the other homeowners down the road drive fast, as well as the fedex lady and mail lady. Our tenants have complained to the post office about the speed of the mail lady. The private road is co-owned by all who own property on the road. Our tenants want a speed bump because they don't like the fast driving. Other than talking to the neighbors (unresponsive) how do we help this problem? The tenants don't spend time outside on the road and we provide gravel twice a year.