If P is the number of vehicles per day at last census, r is the increase in traffic and n is the number of years passed after last census, number of vehicles A per day for design, is

- 1
  
  $P {(1 + r)}^{n}$
- 2
  
  $P {(1 - r)}^{n}$
- 3
  
  $P {(1 + r)}^{- n + 5}$
- 4
  
  $P {(1 + r)}^{5 n}$

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