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Term
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Description
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Chain Law
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Click here to link to Wyoming Highway Patrol's definition of the chain law.
Click here to view the levels of restriction of the chain law.
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No Unnecessary Travel:
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The road is open but travel is not recommended due to hazardous driving conditions.
Generally, this advisory is posted during winter months due to
extremely icy conditions, when visibility is limited due to blowing snow,
or when a combinations of conditions makes travel ill-advised.
Only the most urgent of situations should warrant travel in a No Unnecessary
Travel advisory. Drivers who attempt such travel should be familiar with
local conditions and be very experienced with winter driving.
Please keep in mind that by choosing to travel during hazardous conditions,
you may be interfering with maintenance personnel and their efforts to improve highway safety.
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No Light Trailers:
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WYDOT will post a No Light Trailer message on the information systems when the wind speed is
greater than 50 mph with ANY road conditions.
This advisory pertains to trailers of any size (commercial and non-commercial) and to other
vehicles such as recreational vehicles which are loaded with light materials (or are empty) and
have a profile that is subject to wind gusts. Drivers of such vehicles are advised not to travel
when a "no light trailers' advisory is posted as they can anticipate strong gusts of wind which
may result in the loss of control of their vehicle or the potential for their vehicle to completely
blow over.
Blow-overs of light trailers are very common in Wyoming. Controlling a vehicle during a strong
wind event can be even more difficult when slick road conditions are present.
There is no specific research that has been done to study at what wind speeds and what load
weights trucks will blow over. Therefore, WYDOT cannot provide a specific weight or wind
speed that will cause a trailer to blow over.
Any driver who fails to comply with the "no light trailer" advisory and who is involved in a
crash may be subject to a fine and can expect to pay the cleanup costs and fees associated with
repairing any damage caused to public and/or private property.
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Dry:
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The road is free of puddles and standing water.
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Wet:
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There are puddles and standing water present; spray coming off cars.
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Slick:
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Long, continuous sections of icy or snow packed roads. Greater than 50%
of road section is icy or snow packed.
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Slick in Spots:
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Short, non-continuous sections of icy or snow packed road. Less than 50%
of road section is icy or snow packed.
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Drifted Snow:
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Drifts of any size that cross the white line and cause a driver to feel a bump
or a pull on the steering wheel.
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Snow:
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Snow in excess of an isolated or occasional shower with the potential to stick to the road surface.
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Rain:
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In excess of light showers with potential to make the road surface wet.
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Strong Wind:
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Winds 30 mph average or 40 mph gusts with ANY road condition.
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Fog:
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Fog that may impair visibility.
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Blowing Snow:
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Snow propelled by the wind across or along the road surface at least
1 foot above the ground.
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Limited Visibility:
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Visibility less than 400 feet for any reason.
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