The statute of limitations for filing a claim for personal injuries in Illinois is two years. For property-damage only claims, the person has up to five years to start the claim.
However, with Semi-Truck related accidents it is especially important to get in touch with a specialized attorney right away. More than in many other types of accidents, evidence about accidents involving large trucks has a tendency to disappear if it is not immediately collected.
An Attorney specializing in these kinds of cases will know which kinds of evidence you will need to find or request to support you in your case, and will help you to acquire them in a timely manner before they are lost.