The Federal Motor Carrier Safety Administration has posted on its Compliance, Safety, Accountability website a new tipsheet designed to help motor carriers understand what a warning letter is and recommends actions they can take to improve safety compliance.
FMCSA sends warning letters to motor carriers that have a safety problem under at least one of the Behavior Analysis and Safety Improvement Categories over the previous 24 months. The warning letter provides instructions for accessing motor carrier safety data in the Safety Measurement System.
You can find the new tipsheet here.
Also, for a more general factsheet about the warning letter intervention go here. This factsheet provides a sample warning letter and frequently asked questions.