The figure at right (from the City of Portland's Pedestrian Design Guide) illustrates problems that occur when the turning radius at a corner is overly generous:
Since more sidewalk needs to be "cut away" to create the larger radius, the unprotected pedestrian crossing is longer.
The larger radius allows vehicles to take the corner at a higher speed, further increasing the danger to pedestrians.
This photo show a large curve radius, designed to allow
busses to exit a parking lot. The result is that automobiles can
exit at higher speeds, and the unprotected crossing is about 50 feet
wide.
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