Vhdl to detect car sensor

Hi guys I'm relatively new to the vhdl and I'm finding it very hard to solve a problem.

i would really appreciate it if anyone can help me.

Here's the question.

1) sensor used to detect cars on road

2) total number of cars is the sum of previous number and current number

3) led lights up when 32 cars have been detected

4) active-low load is activated to load previous number into system

5) active-high reset input is used to reset system.

I'm required to produce a waveform that shows the reset, sensor, load, "p", "q" and led_on.

I'll be very glad if someone will look in to this problem.

thanks in advance!