See, they can give us freedom to drive how we see fit, they just won't do it. Example:
Motor carriers shall not require or allow fatigued drivers to operate a commercial motor vehicle. A driver who informs a carrier that he/she needs immediate rest shall be given at least ten consecutive hours before the driver is required to return to service.
...because it would cost them way too much money in lost traffic ticket revenue, as Montana found out when they tried switching from having numerically defined speed limits to "reasonable and prudent" a few years back.