The risk for car accidents on a specific road varies with the time of the day; denote by λ(t) the intensity with which there occurs an accident at a certain road at time   a) What factors can...

The risk for car accidents on a specific road varies with the time of the day; denote by λ(t) the intensity with which there occurs an accident at a certain road at time

a) What factors can influence λ(t), directly or indirectly?

b) Assume
  and find the average number of accidents per day, and the probability of no accidents between six in the evening and six in the morning.