If L is the length of vehicles in meters, C is the clear distance between two consecutive vehicles (stopping sight distance), V is the speed of vehicles in km per hour, the maximum number N of vehicles/hour is _________.
1
\({\rm{N}} = \frac{{1000{\rm{V}}}}{{{\rm{L}} + {\rm{C}}}}\)
2
\({\rm{N}} = \frac{{{\rm{L}} + {\rm{C}}}}{{1000{\rm{V}}}}\)
3
\({\rm{N}} = \frac{{1000{\rm{L}}}}{{{\rm{C}} + {\rm{V}}}}\)
4
\({\rm{N}} = \frac{{1000{\rm{C}}}}{{{\rm{L}} + {\rm{C}}}}\)