Those of you who have been driving in Massachusetts all your lives are familiar with what is needed to change lanes on the highway.  Drivers from out of state, new to the driving scene, are probably curious as to what these people are up to.  The only appropriate time to use directional signals, if you must use them at all, is while you're driving in a straight line down the highway.  Never use them when about to change lanes since then you will make other drivers aware of your intention.  When you detect a vehicle either trying to pull into traffic or accelerating towards you in an attempt to get in front of you, you must adjust your speed such that the gap in traffic will not be there when the vehicle gets to it.  You must anticipate the driver's intention while nonchalantly altering your speed to intercept.