Fog Truck Crash Reaction Time Math, What 6 Experts Say

Last Updated: October 25, 2026

Fog is a weather condition under section 11-601(a). A speed within the posted limit does not relieve the duty to decrease speed for that hazard. Section 2-1116 still measures each person’s share.

Speed in Fog

625 ILCS 5/11-601(a) provides that no vehicle may be driven on a highway of this State at a speed greater than is reasonable and proper with regard to traffic conditions and the use of the highway, or that endangers any person or property. A speed within the applicable maximum does not relieve the duty to decrease speed when a special hazard exists by reason of weather or highway conditions, or with respect to other traffic. The source is P.A. 104-787, effective August 7, 2026. The section does not name a feet-per-second figure.

735 ILCS 5/2-1116 diminishes damages when the plaintiff’s contributory fault is not more than 50 percent of the proximate cause, and it bars recovery when that share is more than 50 percent. The source is P.A. 103-1053, effective December 20, 2024. The section does not assign fault to one driver because that driver crossed a center line.

Miles per Hour and Feet per Second

A statute mile contains 5,280 feet, and an hour contains 3,600 seconds. Dividing those figures converts one mile per hour into 22/15 feet per second, which is 1.4666 feet per second with the 6 repeating. At a constant 60 miles per hour the same conversion is 88 feet per second. At a constant 55 miles per hour it is 80 and 2/3 feet per second. Multiplying that rate by a number of seconds gives the distance covered at that constant speed. The number of seconds has to come from the evidence in the case. Section 11-601(a) does not name a feet-per-second figure and does not adopt this conversion as a required speed.

Frequently Asked Questions

Does fog excuse a speed within the posted limit?

No. Section 11-601(a) says a speed within the applicable maximum does not relieve the duty to decrease speed when a special hazard exists by reason of weather.

Is a one-second sighting a defense by itself?

Section 2-1116 measures the share of the proximate cause. One second at a constant 55 miles per hour covers 80 and 2/3 feet. The section does not treat that distance as a defense.

How do miles per hour convert to feet per second?

Divide 5,280 feet by 3,600 seconds. One mile per hour equals 22/15 feet per second. Sixty miles per hour equals 88 feet per second at a constant speed. The conversion supplies the rate. The evidence has to supply the number of seconds.

When does section 13-202 require the action to be filed?

735 ILCS 5/13-202 requires the actions it covers to be commenced within 2 years next after the cause of action accrued. That two-year sentence does not cover damages resulting from first-degree murder or a Class X felony when the perpetrator is convicted of that crime. The source is P.A. 99-90, effective January 1, 2016. 735 ILCS 5/13-211(a) lets a person who was under 18 when a cause specified in sections 13-201 through 13-210 accrued bring the action within 2 years after attaining 18. That subsection does not state a general delayed-discovery exception.

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Fog Truck Crash Reaction Time in Peoria