The City of Toronto recently introduced "Scramble" cross walks at several intersections downtown.
http://wvs.topleftpixel.com/08/08/29/
Using Google Earth, find a picture of the intersection of Yonge and Dundas. Using the scale bar, find a good estimate of the distance to cross East/West and the distance to cross North/South.
Draw a diagram to represent the intersection. Use the Pythagorean Theorem to calculate the length of the diagonal.
How much distance does it save you to cross on the diagonal relative to crossing in the traditional way.