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DOT number size help needed


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#1 BigGreen

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Posted 10 March 2010 - 07:21 PM

i need to know the size so i can be seen 50 feet sitting still. thanks for thr help.

#2 MrMopar64

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Posted 10 March 2010 - 08:14 PM

According to the chart 3" can be seen from 100'
4"- 150' 6"- 200'

MM64  8)


BTW.... Here is the chart

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#3 helpinghand

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Posted 10 March 2010 - 09:01 PM

I'm not sure if it's the same for all states but here in Wisconsin the minimum height for DOT #'s is 2". And the color must contrast with the vehicle color for easy readability.

#4 BigGreen

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Posted 11 March 2010 - 10:58 AM

thanks y'all that's what i need thanks

#5 zx360

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Posted 11 March 2010 - 12:52 PM

I'm not sure if it's the same for all states but here in Wisconsin the minimum height for DOT #'s is 2". And the color must contrast with the vehicle color for easy readability.


My father actually got nabbed for that about 6 months ago here in WI for not having a DOT number. The officer said he didnt care how big it was but it had to be there... ive seen them as small as 1" around here, but like Helpinghand said, in WI its 2" so thats what i put on my fathers truck.

#6 Buggie Pilot

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Posted 11 March 2010 - 02:28 PM

Comically enough the reqm't for letter size as called out in Federal Motor Carrier Safety Administration Part 390.21 and subsections tecnically Does Not   state a numeric size. They do however make sure that you know that 50 feet is 15.24 meters (typical govt non specific specifications 8))

I recently lettered a car hauler for a company that all of his other trucks had 1 3/4" dot and mc numbers. He gets stopped all the time by dot and has never had a problem with letter size. It seems that if you are close to 2" with good contrast they don't bother you.

That being said I use 2" minimum for all our construction trucks

Federal Motor Carrier Saftey Administration Part 390.21
© Size, shape, location, and color of marking. The marking mustó

©(1) Appear on both sides of the self-propelled CMV;

©(2) Be in letters that contrast sharply in color with the background on which the letters are placed;

©(3) Be readily legible, during daylight hours, from a distance of 50 feet (15.24 meters) while the CMV is stationary;




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