Full copy:

http://www.sandboxarena.com/news/theDirt.aspx

Summary:

Due to dwindling interest from quad riders, the Sandbox Arena will now be CLOSED to quads for open practice purposes, except for a 4 hour period Sunday nights, from 4pm - 8pm. Quads may no longer practice Monday-Saturday. There is still quad racing available on 4 Sundays throughout the winter starting in November.


Opinion:

Since it is only money in the Sandbox's pocket for them to allow quads to practice there, I don't understand their justification for eliminating quads from participating, period. A business struggling to get people to ride there will now struggle even more.
I will personally miss having Sandbox as an option when the spring riding itch comes mid-winter!

Further information:

Call the Sandbox Arena at 1-877-RIDE-MX1 to verify the story.