Figure 3A depicts the frequency of calls throughout the
day and Figure 3B during the week. These distributions
were statistically similar in both districts and display a
typical daily pattern of activity and traffic.
During shifts when more than 5% of calls were not
answered within 8 minutes, two backup ambulances were
added. These ambulances had a response time not exceeding
15 minutes, and they covered an area of more than one
polygon. Figure 4A depicts the layout of the 8-and 15-
minute response time polygons for the first rush hour shift
and Figure 4B the 8-minute polygon for the fifth, off hours
(2 AM–7 AM) shift in the Carmel district. Figures 5A and 5B
depict the polygons for the Lachish district in the first and
fifth shifts. Similar polygon maps were constructed for each
shift on every weekday using the density of calls and the
average driving speeds.