The safe stopping sight distance D, may be computed from the equation

- 1
  
  $D = 0.278 V t + \frac{V^{2}}{254 f}$
- 2
  
  $D = 0.254 V t + \frac{V^{2}}{278 f}$
- 3
  
  $D = 0.254 V t + \frac{V^{2}}{225 f}$
- 4
  
  $D = 0.225 V t + \frac{V^{2}}{254 f}$

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