There are two ways to tell if the timing belt has been replaced. One is obvious-you are looking at a service receipt showing the replacement.
Swimlane diagrams are used whenever you need to show activities, tasks, or process steps which are being performed by different actors/roles. You can use swimlanes to group activities in an activity diagram or process flow by any category what you need: by role, by system, by department, etc.
This is one of the primary functions of the lane ropes. You will easily identify where you are supposed to go so you can swim in a straight line. The straighter you are able to swim, the faster you will be able to finish the race. There are many reasons why swim lane ropes are essential in any pool.