API.onUpdate.connect(function () {
    var player = API.getLocalPlayer();
    if (API.isPlayerInAnyVehicle(player)) {
        var vehicle = API.getPlayerVehicle(player);
        var velocity = API.getEntityVelocity(vehicle);
        var speed = Math.sqrt((velocity.X * velocity.X) + (velocity.Y * velocity.Y) + (velocity.Z * velocity.Z));
        var velocity_human_length = speed * 3.6;
        speed = Math.round(velocity_human_length)
        var screen = API.getScreenResolution();
        var posX = screen.Width / 7.850;
        var posY = screen.Height / 1.285;
        API.drawText("Speed : " + speed.toString() + " km/h", posX, posY, 0.4, 255, 255, 255, 255, 6, 1, true, true, 200);
    }
});