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Traffic Calming Measure Estimated Cost Curb extension and street narrowing $9,000 $15,000 Traffic circle constructed at intersection within existing curblines $5,000 $20,000 Mid -block island $8,000 $15,000 Speed hump /table $2,500/$5,000 Speed bump (to be used only in alleys) $500 Diagonal diverter $40,000 Partial intersection closure $40,000 Cul -de -sac $120,000 Project Phase City Share Resident Share Traffic Study of Neighborhood 100% Basic Measures (e.g. signage, striping, education) 100% Engineering Design and Management of Physical Measures 100% Construction of Physical Measures 100% Future Maintenance of the Installed Physical Measures 100% City of Des Plaines Neighborhood Traffic Management Policy FUNDING When routine maintenance on streets is deferred, the deterioration of the street accelerates, resulting in the need for a premature and very expensive full reconstruction of the street. Therefore, the first priority of the City's capital improvement program is to maintain the condition of the existing streets. There is often insufficient funding to keep up with this primary task of maintenance. As such there will necessarily be a limited amount of City funding available for projects to modify the streets for traffic management purposes. In order to ensure the commitment of residents to the various traffic management projects and to stretch the limited City funds as far as possible, the City is adopting a cost sharing approach for all traffic calming projects. Proiect Cost Share 1 "Basic Measures" include changes to traffic control, speed monitoring and other less expensive measures outlined in the "Allowable Traffic Calming Measures" section above. 2 "Physical Measures" include the physical changes outlined in the "Allowable Traffic Calming Measures" section above. 3 The City will manage the construction and advance the money to complete the project. The subject residences will then reimburse the City through the creation of a Special Service Area (SSA) as detailed in Step 4 of the "Process" section. AnDroximate Cost For Initial Construction of Traffic Calmine Measures 1 Source: Combination of several documents including ITE /FHWA, 1999 "Traffic Calming State of the Practice." and —1999 Newark, NJ study of ITE reported projects. Prices from study adjusted to 2009 assuming 3% annual inflation. National information from websites tends to be both dated and wildly variable so these costs must be treated as very rough estimates. Local costs from neighboring communities (e.g. speed humps) were used when available. Costs vary considerably depending upon nature of the measures installed (e.g. extent of landscaping for traffic circles, drainage structures impacted by curb extensions). Construction of measures as stand -alone projects is more expensive than constructing them as part of a larger street reconstruction project. Page 5of12