The County of Lanark has provided a way for you to stop spraying on your road allowance. You must submit an application by May 18, 2017. The county weed control policy is posted here. There is an article about the spray exemptions on Lake88 here.
There are a couple of versions of the exemption form going around. The one linked to the aforementioned Lanark policy page looks the most official. Download that PDF here. Or save and print the images below.