Traffic was flowing on major Colorado roadways Saturday morning despite the snow and ice that settled across the Front Range late Friday, putting many emergency services agencies on accident alert. The Colorado Department of Transportation’s statewide map showed all interstate and major state highways open as of 10:30 a.m., with dozens of plows busy scraping roadways. RELATED: Everything you need to know about the polar vortex bringing extreme cold to Colorado A Winter Weather Advisory published by the National Weather Service remains in effect around Fort Collins, Boulder, Denver, Castle Rock and Greeley through 5 p.m., reflecting slick driving conditions. Colorado State Patrol advises drivers to check their vehicle batteries, fluids and tire pressure, all of which can be affected by extreme cold, before temperatures are expected to fall below zero degrees Saturday night. Get more Colorado news by signing up for our daily Your Morning Dozen email newsletter.