No and people have obviously put gaps in the cones/barriers that are not meant to be there. Although way more people on the bmx track than the crit circuit that being said
Pretty sure it's not just cones/barriers, there's a fence all the way round it. So you'd have to climb a fence and they have CCTV, security etc. So I'm quite surprised people are getting away with it.
Is the road / crit course open for free use?