Implement a Java concurrent program using semaphores to access a car park with two gates, the park has a maximum capacity of $500$ cars. The car runnable is given below:

class Car extends Thread$\{$ Tunnel tunnel;

public Car$($Tunnel t$)\{$

tunnel $=$ t; $\}$

public void run$()\{$ tunnel.enter$()$;

try$\{//$stay in tunnel for random period int t $=($int$)($Math$.$random$()*5000)$; Thread.sleep$($t$+2000)$;

$\}$

catch$($InterruptedException e$)\{\}$ tunnel.leave$()$;

$\}\}$