Some sample data AND the desired results will help. I find the easiest is to use Excel and paste it here - you get a table that you can tweak if you need to.
Try not to use jargon or intermix your terms. I can't tell if a trip and an incident are the same thing or not.
At least, you need a table for users, one for trip types (that's optional, but will help you control what's in it) and one for trips. The trips table can hold user ID as a foreign key, trip type as a foreign key, and the dates. Other fields like comments/notes could be in this tblUserTrip as well. Once you have the requirements (whatever that may be) you use forms to control data inputs.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.