A Time Trial is a solo session to practice running clean and consistent laps.
Are Time Trials counted towards SR?
Time trials are official solo sessions, meaning your Safety Rating (SR) and Time Trial Rating (TTRating) are affected.
What are the requirements for a Time Trial?
You must complete a set number of consecutive incident-free laps (which varies by track and series) within a 30-minute window. You must license the specific car and track needed and run a minimum number of clean consecutive laps to count.
To see how many consecutive clean laps are required for the time trial to count, register for a time trial, launch the session and check the top left before entering the car (see example below).

What sessions have Time Trials?
Nearly all Ranked Official series have time trials, but multi-class events and team-driving events do not feature time trials.
Where to find Time Trials?