Tech start-up Haystack has developed an innovative – and controversial — solution to the stressful challenge of finding an open parking meter in congested areas. This smartphone app allows those leaving a parking space to alert other Haystack users in the area of their “about-to-be” open spot. To secure this meter (i.e., have the parked car driver wait until they arrive), users pay a fee of $3 (75 cents goes to Haystack while the incumbent “parker” pockets $2.25). Not surprisingly, Haystack has stirred up controversy amongst city officials, particularly in Boston, as well as drivers.