Illinois Default Speed Limits
Default speed limits where no sign is posted: residential, urban, rural, school zones, and interstate maximums.
- Residential default (mph)
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30
Source: Illinois Rules of the Road 2026, Chapter 4: Speed Limits, p. 24 Verified Sep 2026
- Urban default (mph)
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30
Source: Illinois Rules of the Road 2026, Chapter 4: Speed Limits, p. 24 Verified Sep 2026
- Rural default (mph)
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55
Source: Illinois Rules of the Road 2026, Chapter 4: Speed Limits, p. 24 Verified Sep 2026
- Four-lane highway default (mph)
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Illinois publishes highways with four lanes as their own road class at 65 mph, between the 70 mph interstate maximum and the 55 mph default for other highways and rural areas. Local municipalities may post something different.
- Alley default (mph)
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An Illinois alley carries a 15 mph default unless a sign says otherwise. It is the lowest standing limit in the state list and the only one below the 20 mph school zone.
- School zone (mph)
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The school-zone limit is 20 mph, and three conditions have to hold together before it applies. It is a school day, which Illinois defines as beginning at 6:30 a.m. and ending at 4 p.m. Schoolchildren are present and close enough to the road that the traffic is a hazard to them. And the zone is signed, because the limit does not apply at all unless the responsible authority has posted and maintained the signs. Outside those conditions the ordinary posted limit governs, so the same stretch of road can be a 20 mph zone at nine in the morning and a 30 mph street at nine at night. The definition of school covers public, private and religious primary and secondary schools and nursery schools. Speed-detection equipment may be used within 500 feet of the zone signs.
- Interstate maximum (mph)
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70
Source: Illinois Rules of the Road 2026, Chapter 4: Speed Limits, p. 24 Verified Sep 2026
- Turning right (and left) on a red light
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Right on red is allowed statewide after a complete stop, unless a sign prohibits the turn. You may also turn left on red from a one-way street into a one-way street after stopping. After stopping you must yield to any vehicle already in or closely approaching the intersection and to pedestrians and bicyclists in the intersection or an adjacent crosswalk. 625 ILCS 5/11-306(c)3 states the rule for both turns in one sentence: except when a sign is in place prohibiting a turn and local authorities by ordinance or State authorities by rule or regulation prohibit it, traffic facing any steady red signal may cautiously enter the intersection to turn right, or to turn left from a one-way street into a one-way street, after stopping. Note the statute treats the sign and the underlying ordinance or rule as paired, so a lawful prohibition is posted at the intersection; Illinois has no jurisdiction-wide ban of the New York City type. Paragraph 3 is written as an exception to both paragraph 1 (steady circular red) and paragraph 2 (steady red arrow). One more Illinois-specific provision sits alongside it: paragraph 3.5 lets the driver of a motorcycle or bicycle who has stopped at a red that fails to change within a reasonable time of not less than 120 seconds, because of a malfunction or because the signal did not detect the vehicle, proceed after yielding, treating the signal like a stop sign.
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