They help demand management because if they're set low enough, people can't use the highway 5 times a day, they have to limit their usage to just once a day, or

They help demand management because if they're set low enough, people can't use the highway 5 times a day, they have to limit their usage to just once a day, or maybe a few times a week. In Australia the bandwidth caps used to be specifically set up with a different peak and off-peak cap to help with this even more.