I'm planning a cross country drive in my M5 in March and was thinking about stopping by Bonneville on my way to CA. I've read about Speed Week, but I haven't seen any info about whether the salt flats are closed or not to the public when it isn't Speed Week. Can I just pull off the Interstate and open her up there, or are there gates/rules etc that prevent this type of thing? Any pointers would be appreciated. Thanks.