Wide crossing due to over-generous corner turning radius

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.

Curve radius

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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Curve radius example