Antonyms for the phrase "demand toll" could include "exempt" or "waive". "Exempt" suggests that a toll is not required or demanded in certain situations, while "waive" implies that the demand for a toll is lifted entirely. Other potential antonyms might include "relinquish", "yield", or "forgo", which all suggest giving up a demand or expectation for a toll. In general, antonyms for "demand toll" would likely involve words that suggest a lack of obligation or requirement, or that imply a willingness to forego or give up something that might otherwise be expected or demanded.