Merla Your road project is a wonderful idea keep going use the KISSS formula Keep IT Simple,Stressfree, Successful.
The weeds indicate an acid soil with a high potassium loading, a lack of calcium and poor organic matter content.I feel that the pfeiffer spray may not be of much benefit to this situation due to the lack of organic matter. Ifeel that a barrel compost made using Steve STorch method that is all the PREPS including horn clay and maybe with some of the pfieffer spray as well. If you make this on your own property it may solve many of your legal problems. I agree with Dave Robisons post mulching and mowing weeds before they set seed is the best method.I also would suggest that you look at sowing wild flower seeds straight after mowing and let nature help you.USE wild flower seeds that are suitable to your soil type. If you also sow seed just before the snow thaws this will water and feed young seedlings and help them become established.Blue lupin and clover mixed with the rye and oats also makes a good green crop. A year or so back someone on this list set up some wild flower plots. Once you have the intial planting established let nature help you in ayrer or two,s time you will have the most attractive road in the county. In New Zealand they have been running trial plantings of wild flowers and it hasnow been accepted nation wide i believe. Good luck and best wishesand may nature provide. Tony Robinson NewZealand
