Speeding and stop sign running goes on throughout the whole day and night, even when the gates are closed. And it's very hard or impossible to get license plate #s or often makes/models when they're speeding by, especially at night. Most of the time, I see them from inside my house.
Another thing I've noticed is that traffic seems to have increased on Candelaria ever since the speed bumps were installed at the other gate. Possibly to avoid the speed bumps there? I still think we need speed bumps at the Sonoma Pkwy gate to the Summit, too.