Mn/DOT Warns of Black
Minn. The Minnesota Departments of Transportation
is warning drivers of black ice.
ice can be one of the most dangerous conditions on winter
roads, said District Engineer Jim Swanson. It
is almost invisible and can catch drivers off guard,
he added. Black ice is clear and appears black because the
dark asphalt surface underneath shows through. It can form
on heavily congested highways from auto emissions, but other
roads are susceptible including those in shaded areas, near
lakes and rivers, in tunnels and on overpasses.
can increase safety by observing the following tips:
Be aware that black ice is almost invisible.
- Be especially careful on bridges, overpasses and tunnels
and in early morning when the air temperature is rising
faster than the pavement temperature.
- Never brake while driving on ice. Applying pressure to
your brakes while on ice will cause a vehicle to skid. Brake
only during your approach.
- Keep your distance. The distance needed to stop on ice
is twice as long as under normal driving circumstances.
Keep at least a three-car distance from the vehicle directly
in front of you.
ice forms when the air temperature is warmer than pavement,
which causes moisture to rapidly freeze and create a thin,
transparent layer of ice on the roadway. It can be neutralized
with salting and sanding. However, drivers should be aware
that salt loses its effectiveness at about 15 degrees and
Fast. Too Close. Too Late.
in the WORK ZONE Together
statewide up-to-date traveler information, Minnesotans are now
able to access weather-related road conditions, construction and
congestion by dialing 511 or by logging on to www.511mn.org
501 S. Victory Dr.
Mankato, MN 56001-5302
Public Affairs Coordinator