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22 <br />ORANGE COUNTY, NORTH CAROLINA <br />The maps indicate the streets and area covered intwo-minute increments. The <br />maps required the assignment of average travel speeds to roadways. The maps <br />presented in this report have incorporated an average speed of 28 miles per hour <br />(mph) for roadways in the County. There are 1,798 miles of improved and <br />unimproved highways, roadways, vehicular trails, and long driveways accessing one <br />or more dwelling units or places of employment in Orange County. <br />The computer maps graphically show the response capability of emergency <br />response agencies. The maps also generate data, which allows an assessment of <br />response capability. These data indicate the streets (miles) and area served by the <br />current system. The maps show the street miles and percent of street miles covered <br />in time increments by a response unit responding to an emergency. The maps <br />present coverage in two-minute time increments. <br />The travel time maps only depict over-the-road travel, or running, times. A <br />review of dispatch information indicates that the average dispatch time (receipt of <br />a call to dispatch) from 2007 to 2009 is slightly less than two minutes. Dispatch time <br />and turn-out time should be added to these times for an estimate of total response <br />time. For example, afour-minute travel time response represents only part of the <br />response time to an incident. It is necessary to add dispatch time to the travel time <br />to establish the total response time. <br />The data associated with Maps 3 and 4 is shown in Exhibit 14. The exhibit is <br />composed of two parts. The top part of the exhibit shows travel time within each <br />time segment; the bottom part of the exhibit presents cumulative response, over <br />time. It is important to note that the map and associated data is intended to show <br />overall response in the County. <br />When considering the entire County fire and rescue system (and assuming <br />conservative road speeds), approximately 230 street miles (13 percent) within the <br />County are covered within two minutes travel time. Within six minutes travel time, <br />fire departments responding from stations cover 45.9 percent of the County's area <br />and 58.5 percent of the County's road miles; within eight minutes travel time, <br />approximately 78.8 percent of road miles are covered. <br />The Carrboro Fire Department and Chapel Hill Fire Department are able to <br />cover their entire response areas within four minutes travel time. <br />~} MMA CONSULTING GROUP, INC. 19 <br />