County of Hawai`i is an Equal Opportunity Provider and Employer Roundabout and Traffic Circle Roundabouts and tra c cir- cles are used to improve safety, and tra c  ow, at intersections. Tra c circles are raised islands in the center of residential street intersections and reduce speed Center Island by forcing motorists to maneuver around them. All tra c travels and Choker in a counter-clockwise direction Center islands and chokers around the roundabout’s center slow tra c by narrowing the island. Thus all left-turn con icts travel lanes and creating a Zig Zag and Hawai 'i County uses innova- sense of enclosure. A center Speed Humps and tive tra c calming devices such island is a raised area along Curve Lines as zig zag pavement markings. the centerline of a street Speed Tables Zig zag lines are painted on the that narrows the travel lanes. Speed humps and speed street at busy intersections and Chokers are curb extensions Smart Signs tables slow tra c by creat- in school zones to get motorists’ that also narrow the roadway. Smart (radar) Signs are infor- ing a vertical de ection in the attention to slow down, making The successive use of the mational signs that display the roadway. A speed hump is a our streets and highways safer center island and choker also speed of oncoming vehicles or rounded, raised area three to for everyone. Other markings on creates a horizontal de ec- a reminder for the driver to slow four inches high placed across County roads include the center- tion (pushing vehicles to down. Smart Signs use highly the road in parking lots and resi- lines, crosswalks, stop and turn the outside of the lane, then at intersections are eliminated. visible LEDs to make motorists dential areas. A speed table is a symbols, no passing and safety back towards the center (as Drivers should be aware of the more aware of their speed and to wide  at-topped speed hump zones, and parking spaces. To illustrated), further adding to pedestrian crossing when ap- encourage safer driving behavior. and slows vehicles more gradu- report markings that are faded the calming e ect. proaching and departing the They are a tra c-calming solution ally than humps. Speed tables or need attention, call the Tra c intersection. Large vehicles are that has been proven to slow traf- are used in locations where low Division, (808) 961-8341 or visit able to drive over the asphalt  c down and are installed in resi- speeds are desired but provide a http://traffic.hawaiicounty.gov.dpw. co.hawaii.hi.us center island if they cannot com- dential areas and in school zones. gentler ride and are preferred by Zig zag lines mark intersec- pletely maneuver within the trav- They provide speed data to the emergency response providers. tions in downtown Hilo and el lane. Pedestrians and bicyclists police department but are not to Look for speed humps on school zones at Kapiolani and can continue to use the shoulder be confused with radar cameras. La'e La'e in Waimea, and Haleki'i Kealakehe Elementary. Sharks to go around roundabouts and Smart Signs are installed Ali'i and Kupuna streets and Royal Teeth painted along Leilani traffic circles. Traffic circles are Drive and Haleki'i, Kaiminani and Poinciana Drive in Kona, and Avenue in Puna were recently installed on Haleki'i Street in Hina Lani streets in Kona and Hilo at Kūkūau, Alaē, and Haili installed to focus a drivers’ atten- Kona Scenic Subdivision. Paniolo Drive in Waikoloa. streets. tion to the curves on the road.

De nition Goal Tra c calming guidelines developed from research done by The goal of tra c calming is to make our streets the Institute of Transportation Engineers and adapted to  t safer for all users, especially children. Implementing Hawai'i’s geography, provides the basic information on the calming devices creates e cient tra c  ow and allows concept and the approach the County of Hawai'i has taken to residents to enjoy safer neighborhoods. apply tra c calming measures. Working together as ONE to improve the quality of service for the health and safety of our Big Island ‘Ohana.