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ITIS Phrase Tables, Draft [issued: 04-11-09]
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225 -
This is a draft document of the SAE ATIS committee, subject to change.
8.8
Encoding Weight Limits and Prohibited Use Patterns
Signs of this type (typically denoted an R12 or a D8 category types in MUTCD) are typically used to state
limits of weight, height, axles count or other restrictions on travel over roads, bridges, and other objects.
The pattern to be followed is:
<direction or arrow><named object><destination details><optional distance, value, units>
Often more than one restriction may be stated in a single sign expression; such cases should be separated
by the “and” phrase.
In constructing signs using these patterns the following rules shall be observed:
The units term shall be present only when it is preceded by a numerical value.
When there is no speed unit code present the value shall be in units of MPH.
When there is no weight unit code present the value shall be in units of tons.
When there is no height unit code present the value shall be in units of feet.
When there is no distance unit code present the value shall be in units of miles.
Examples of proper encoding proper advisory sign values:
Value to be expressed
Preferred Encoding
Byte Sequence
Weight Limit
weight limit
2577
Weight Limit 10 tons
gross weight limit, n10, tons
2577, 12554, 8740
Weight Limit 10 tons (metric)
gross weight limit, n10, metric tons
2577, 12554, 8737
Axle Weight limit 5 tons
truck restriction, axle load limit, n5, tons
2563, 2576, 12549, 8740
No Trucks Over 32000 LBS
truck restriction, gross weight limit, n30000, n2000, pounds
2563, 2577, 11599,
11555, 8739
Trucks Allowed
trucks allowed
9227, 7744
Trucks Prohibited
no, trucks
7738, 9227
Truck Rollover (Danger of Tipping)
MUTCD graphic
13619
Low Clearance
height limit
2574
Clearance 14 ft 6 in
height limit, n14, n1-2, feet
2574, 12558, 11526, 8710
No Western Doubles
no, vehicles with double trailers
7738, 9232
Caution: Low Ground Clearance
caution, low ground clearance
12330, 5938