text: This phenomenon occurs when free flow transitions to synchronized flow, which can further transitioninto its wide-moving form, according to Boris Kerner's three phase theory.
full_question: This phenomenon occurs when free flow transitions to synchronized flow, which can further transitioninto its wide-moving form, according to Boris Kerner's three phase theory. In a famous example of induceddemand, increasing capacity does not, in the long-term, decrease the incidence of this phenomenon becauseadditional peak-period trips take place until its incidence is back to previous levels. Some theories about thisphenomenon were formulated based on data collected from the Bundesautobahn 5. HOV lanes are designed todecrease the incidence of this phenomenon. For 10 points, name this transportation phenomenon oftenencountered during rush hour, in which an excess of cars leads to a slowdown in travel times. 
first_sentence: This phenomenon occurs when free flow transitions to synchronized flow, which can further transitioninto its wide-moving form, according to Boris Kerner's three phase theory.
raw_answer: traffic congestion [or traffic jams; or traffic congestion; or traffic jams]