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A non-profit organization advocating for improvements on the I-70 mountain corridor.

Frequently Asked Questions


Do cars with bald tires cause I-70 closures? Passenger vehicles with inadequate tires have been identified as a major cause of delays and closures on I-70 traffic. The Colorado State Patrol says that 60 percent of congestion delays on I-70 are due to crashes. It is safe to assume that bald tires contribute to some of these car accidents. In addition, cars that lose traction on hills cause blocked lanes and closures that significantly contribute to travel delays.

Does the chain law apply to passenger vehicles? Colorado does have a Passenger Chain Law. When it is in effect, cars with less than an eighth of an inch of tread on their all season or snow tires must use chains or a traction device such as the Auto Sock for added traction.

Why doesn’t the state require tire inspections before allowing travel on I-70? Tire inspections are not required in the state of Colorado. Stopping cars at I-70 on-ramps to check tires is not a viable solution due to the traffic jams that action would cause. CDOT and Colorado State Patrol have recently implemented extensive public education campaigns around the importance of adequate tires on the I-70 corridor.


Can you park a car overnight at the Dinosaur Lots? CDOT manages the Dinosaur Lots at the Morrison exit in Golden, but the Jefferson County Sheriff's Department patrols them. Overnight parking is allowed, but cars left there for an extended period might be considered abandoned and be towed. Leaving your car there for just a few days is not anticipated to be a problem, but contact the Jefferson County Sherriff's Dept. with questions.


Why can’t CDOT restrict commercial vehicles from traveling on weekends? Federal law does not allow for limiting trucks on an Interstate based solely on time of day, day of week, or time of year. However, CDOT will use its authority to hold commercial motor vehicles when adverse weather combines with significant congestion to create public safety concerns.


Does the Colorado State Patrol (CSP) ever enforce the Left Lane Law?  Yes, the Colorado State Patrol does enforce the left lane law. When a road is two or more lanes and the posted speed limit is 65 MPH or greater, they will contact drivers that are using the left lane as a travel lane. If traffic is at a rate that the left lane is being used as a general traffic lane, they allow vehicles to use the left lane continuously to keep traffic flowing as much as possible.

When a truck passes in the left lane, going far below the speed limit and causing traffic to slow down significantly, is this a violation the trucker could be ticketed for?  See above. A truck passing on the left is no different than a car passing on the left.

Does CSP issue tickets/fines to cars that have sub-standard tires?  The Colorado State Patrol does issue citations for unsafe tires. Because of the difficulty of seeing tires as a vehicle moves, this is not a violation seen until they contact a driver for a separate reason.

I often see trucks without chains while the chain law in effect.  Why aren’t these truckers ticketed by CSP? The winter season of 2014/2015 saw an increased focus by the members of the Colorado State Patrol Motor Carrier Safety Branch in identifying commercial vehicles violating the chain law codes. When that violation is observed, it is cited. There are other traction control devices that satisfy the requirements and sometimes those devices are not as visible as chains. An example of this would be the automatic sanders that a greater number of vehicles traveling the Interstate 70 corridor are using. 


How do I stop getting text/email messages from CDOT? The “GovDelivery” text and email is the most detailed and timely communications stream offered by CDOT. Some find it provides more information than they want. To turn off (or on) these communications, visit and change your preferences.

Possible Solutions

Can’t CDOT use Reversable Lanes during peak travel times? Traffic on I-70 in both directions have reached levels that no longer allow for lane reversal as a strategy to address peak congestion. According to CDOT data, the backups in the single lane would be longer and more significant than the current backups in the peak travel direction. In addition, there are significant safety and cost implications of changing one direction of the interstate to a two direction travel highway. Here is a report from the exploration of the 2010 Zipper Lane concept.


Wouldn’t a weekend I-70 bus fix the congestion problem? On winter weekends, cars traveling I-70 have an average of 2.7-3.2 occupants per vehicle. A substantial shift in people coming from the Denver metro region in buses rather than cars would provide some congestion relief, but would still not be enough to solve the I-70 congestion issue. Furthermore, public polling shows that I-70 travelers are willing to pay an approximate $25 round trip bus fare to the resorts, but private operator’s identify a fare of $35-$60 is necessary to make such service commercially viable.

Why doesn’t the Winter Park ski train resume service? The City and County of Denver ran the ski train from Denver to Winter Park until the early 2000s and then sold it to a private entity. That operator has since ceased running the business. Any entity interested in starting up the ski train business again would need to get permission/approval to use the rail line from the freight railroad operation, Union Pacific. In this country, freight traffic takes precedent over passenger traffic. The demand for freight transportation on the rail line the ski train used is already at or near capacity. This is essentially the issue that caused the previous ski train to cease operations. There were instances where the ski train was held for several hours waiting for freight traffic to clear the line through the Moffat Tunnel. In addition, the Moffat Tunnel was built at the beginning of the last century and has no ventilation capacity, so this further restricts traffic allowed on that line to one diesel locomotive every 45 minutes. Amtrak ran service to Winter Park Resort on one weekend in February 2015 and seats sold out in a matter of hours. Amtrak says they will explore providing service to Winter Park during the 2015-2016 winter season.


Which agency makes the decision to close the interstate due to weather or incidents, CDOT or CSP?  The Colorado Department of Transportation has the ultimate authority to close the interstate. 



 We offer two options to keep I-70 travelers informed of current
activity and future plans for the I-70 mountain corridor.

I-70 Alert

The I-70 Alert e-newsletter keeps you up to date on the big picture, including current and future policies, projects, studies and initiatives aimed at fixing I-70. 
Frequency: Quarterly

SIGN UP eBlast eBlasts keep you informed on potential impacts and opportunities related to your trips on I-70. These short updates contain timely info on construction projects, new transit options, CDOT winter operations and strategies for beating the crowds.
Frequency: An average of 1-2 times/month