You are following another vehicle. In Nebraska, what is the recommended following distance?

The Nebraska Driver's Manual recommends a following distance of at least three seconds between you and the vehicle in front of you. You can measure your following distance by noting when the vehicle in front of you passes some stationary object and then counting the seconds that elapse before you reach the same object. If driving conditions are poor, you should increase your following distance. [2G-1 – Techniques, 2G – Defensive Driving, Section 2 – Important Driver Information, Nebraska Driver's Manual]