[dice7]

Slight edit:

pawn Code:

if(strcmp("/respawnallcars", cmdtext, true) == 0)
{
   if(IsPlayerAdmin(playerid))
   {
     for(new i = 1; i <= MAX_VEHICLES; i++)
     {
        SetVehicleToRespawn(i);
     }
     SendClientMessage(playerid, COLOR_GREEN, "You have respawned all vehicles.");
   }
   else
   {
     SendClientMessage(playerid, COLOR_RED, "You are not an admin.");
   }
   return 1;
}

since vehicle ids start with 1 and end with MAX_VEHICLES