Depends on what and where the delay was and if you could have stopped earlier. in your defence there would be others in the same boat and therefore more trucks stopped in the area preventing you to stop safely closer to your driving hours … make sure you put everything you can on the back of the tacho about the delay , location of delay and why you chose to park where you did… also you could ask the police in the area for a log number of the incident and add that as it would look better that you have taken every precaution to park asap and it wasn’t a fob off to get somewhere you wanted
“Exceeded driving time due to accident on A14, used first available parking.” then sign it. That’ll cover it and is all you really need to do. Your speed trace, I take it from what you have written you are on charts, will back you up as it will show lots of stopping and starting with short movements.