IRVINE – The City Council on Tuesday reduced speed limits on 10 road segments, increased the permissible speed on one segment and set speed limits for 16 new street segments.

The changes came as part of the city’s annual review of the maximum street speeds, recommended by the state to be set within a 5-mile-per-hour increment of the 85th percentile speed of traffic.

Data gathered through traffic surveys of 113 segments of the city’s 563 street segments guided the changes.

Where speed limits will be decreased:

• Harvard Avenue from Michelson Drive to Main Street (to 45 mph from 50 mph)

• Hicks Canyon Drive from Kara to Yale Avenue (to 35 mph from 40 mph)

• Irvine Center Drive from Bake Parkway to Scientific Way (to 50 mph from 55 mph) and Scientific Way to Lake Forest Drive (to 45 mph from 50 mph)

• Portola Parkway from Portola Springs to 241 toll road (to 50 mph from 60 mph)

• Research Drive from Irvine Center Drive to Bake Parkway (to 45 mph from 50 mph)

• Roosevelt from Monroe to Yale Avenue (to 40 mph from 45 mph)

• Springbrook North from Springbrook South to East Yale Loop (to 35 mph from 40 mph)

• Spring Meadow from Medallion to Groveland (to 35 mph from 40 mph)

• Turtle Ridge Drive from Newport Coast Drive to Bonita Canyon Drive (to 40 mph from 45 mph)

Where speed limits will be increased:

• Culver Drive from Irvine Boulevard to Meadowood (from 50 mph to 55 mph)

Where new speed limit signs will go up:

• Spyglass from Knollcrest to Weathervane (35 mph)

• Ridge Valley from Portola Parkway to Port/Cienega (35 mph) and from Port/Cienega to Irvine Boulevard (45 mph)

• Roosevelt from Jeffrey Road to Visions (35 mph), from Visions to Bay Tree (35 mph), from Bay Tree to Tulip (30 mph) and from Tulip to Sand Canyon Avenue (35 mph)

• Bay Tree from Trabuco Road to Roosevelt (35 mph) and from Roosevelt to Starry Iris (30 mph)

• Rush Lily from Roosevelt to Nightmist (25 mph)

• Scented Violet from Roosevelt to Starry Iris (30 mph)

• Visions from Trabuco Road to Roosevelt (35 mph)

• Tulip from Trabuco Road to Roosevelt (35 mph) and from Roosevelt to Nightmist (35 mph)

• Nightmist from Rush Lily to Tulip (25 mph) and from Tulip to Sand Canyon Avenue (30 mph)

The new signs are expected to cost about $9,000 to install, according to a staff report.

Contact the writer: sdecrescenzo@ocregister.com