Question 909588
<pre>
Every point where the jagged green line intersects a street is a 
point that is the same taxicab distance from P and Q. Notice that
every point which is equidistance from those points is right in
the middle of a block.


{{{drawing(800,240,-15,5,-2,4, graph(800,240,-15,5,-2,4),grid(1),

green(line(-20,2.5,-6,2.5),line(-6,2.5,-3,-1/2),line(-3,-1/2,10,-1/2)),



circle(-6,-1,0.15),circle(-6,-1,0.13),circle(-6,-1,0.11),circle(-6,-1,0.09),circle(-6,-1,0.07),circle(-6,-1,0.05),circle(-6,-1,0.03),circle(-6,-1,0.01),

circle(-3,3,0.15),circle(-3,3,0.13),circle(-3,3,0.11),circle(-3,3,0.09),circle(-3,3,0.07),circle(-3,3,0.05),circle(-3,3,0.03),circle(-3,3,0.01)

)}}}

Edwin</pre>