Avoid the whole problem including the I-70/I-270/I-25 traffic mess by doing this...
Pena Blvd to Tower Road exit
Tower north to 104th.
104th west to US 85
US 85 almost to the town of Platteville, CO
West on CO-66/County Road 30
Rejoin I-25 far enough north to avoid the crap
Continue on to Ft Collins
Takes 14 minutes longer than the all Interstate route if traffic is no factor. The I-270 and I-25 merge point is always jammed horribly at rush hour. This route keeps moving other than there being a few stop lights, and it's a nicer drive with stuff to see.
Only thing to watch is the cops in the towns on US-85 are serious about the speed limits in the towns. No big deal. Just slow up for a few blocks and then back to 55. It moves right along.
That'd be how I'd avoid the toll. US-85 is the Union Pacific rail line between Denver and Cheyenne, so you'll probably get to see some trains alongside too.