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I am stuck on this question

From this article, i have to answer this question:

Traffic on Sydney's clogged roads and motorways is now so congested it is costing the majority of businesses in Western Sydney up to $5000 a year. The startling figures were revealed as part of the NRMA Motoring & Services BusinessWise survey of almost 730 businesses that run vehicle fleets. Frustrated local businesses who took part in the survey said travel times for each of their work vehicles had jumped, on average, by 59 minutes every day due to roads clogged by commuters forced into their cars because of poor public transport options. In the past year about six out of 10 Western Sydney firms said their fuel bills had risen as a result of congestion.

(O'Rourke 2014)

Identify the negative externality discussed in the article. Explain, using a graph, how the negative externality leads to an inefficient price and level of output. Provide two solutions that you would recommend to the government to address the externality.