c
#define VEHICLE_MODEL_ID 411 // Infernus

forward SpawnVehicle(playerid, modelid);

public SpawnVehicle(playerid, modelid)
{
    new Float:x, Float:y, Float:z;
    GetPlayerPos(playerid, x, y, z);
    new veh = CreateVehicle(modelid, x, y, z + 500.0, 0.0, 0.0, 0.0, 0);
    if(veh)
    {
        PutPlayerInVehicle(playerid, veh, 0);
        return 1;
    }
    else
    {
        return 0;
    }
}

public OnPlayerCommandText(playerid, cmdtext[])
{
    if(strcmp(cmdtext, "/veh", true) == 0)
    {
        if(SpawnVehicle(playerid, VEHICLE_MODEL_ID))
        {
            SendClientMessage(playerid, -1, "A vehicle was spawned!");
        }
        else
        {
            SendClientMessage(playerid, -1, "Failed to spawn vehicle!");
        }
        return 1;
    }
    return 0;
}