I ran a simulation for the critical density at which traffic flow transitions from laminar flow to start-stop-waves. The results for different road lengths are:
From the graph we can see that the critical density decreases as the road length increases. Is there any test I can do that guides me into a point where my data may converge?
All I can be sure is that it converges at least to 0 (which physically makes sense to me). How can I test that it does not converge to any other value greater than 0?
PS: It takes me about a week of the code running to get very high values (1 single point at $10^4$ took 5 days of the program running).
PPS: I add a link to the data Data in case someone wants to try something.