TxDOT should use chemicals that are proven to be effective on the target pest species, low in toxicity and are not dangerous to the traveling public, applicators or the environment. Most materials used to control growth of vegetation are either patented or proprietary products. Materials proposed for departmental use are continually being tested for possible highway use to determine their effectiveness and any harmful side effects. Research and test applications are coordinated through the Vegetation Management Section. Detailed information on herbicide operations is located online in the .