DRIVERS travelling on the Hume Highway should anticipate slight delays after a truck broke down near Coolac early on Wednesday morning.
Southbound traffic is being merged into one lane after the highway's second lane was closed to passing vehicles.
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The Live Traffic NSW website has advised drivers to exercise caution and reduce speed while travelling on the Hume Highway about three kilometres south of Cooininee Road.
Emergency services and Transport for NSW attended about 4.45am after reports of the breakdown, according to the live traffic website.