Answer:
The multidimensional array is declared as
int westboundHollandTunnelTraffic [ ] [ ] [ ] [ ];
Explanation:
int is the type of the array which is short for integer as the given type of data to be stored is all integers.
westboundHollandTunnelTraffic is the name of the array which is as given in the question.
[ ] [ ] [ ] [ ] are the dimensions of the array which are 4 in number for the innermost being for year, the next one for weeks, the further one for days and the outermost for hours.