Road Survey In Progress (TC1291)The Road Survey In Progress (TC1291) traffic control sign is designed to inform motorists of survey activities taking place on or near the roadway. It provides advance warning to reduce speed and proceed with caution around surveyors and equipment. Manufactured with super bright traffic yellow CL400 Class 1W reflective material, this sign ensures maximum visibility during both day and night operations, improving safety for both workers and road users.