Work zone signs
Survey Crew sign
Surveyors are taking measurements in or near the roadway, sometimes standing in a lane briefly with no barrels or heavy equipment around them.
- Diamond
- Orange
- MUTCD W21-6
Shape and background first
Federal designation W21-6 in the MUTCD, the national standard every state signs to. Seen ahead of highway widening or realignment projects while engineers are still marking out where the new road will go.
What the MUTCD specifies
Designation: W21-6
MUTCD Section 6H.23
Conventional road size: 36 x 36 in
Source: Federal Highway Administration, MUTCD 11th Edition (December 2023), Part 6, Table 6H-1, verified 2026-09-26.
What the test wants you to know
The mistake people make
This is the sign most likely to catch a driver off guard, because there is no dump truck or paver to signal that a work zone is active, just a small crew and a tripod. Reduced speed and doubled fine rules still apply, which is exactly what test writers like to check with this one.
