A team of technicians has been dispatched to inspect Sydney's sprawling tollway tunnels after cracks recently appeared in the roof of the M4. 7NEWS went along for the ride as tollway owner Transurban insists the underground network is safe.See <a href="https://omnystudio.com/listener">omnystudio.com/listener</a> for privacy information.See <a href="https://omnystudio.com/listener">omnystudio.com/listener</a> for privacy information.

A team of technicians has been dispatched to inspect Sydney's sprawling tollway tunnels after cracks recently appeared in the roof of the M4. 7NEWS went along for the ride as tollway owner Transurban insists the underground network is safe.See omnystudio.com/listener for privacy information. See omnystudio.com/listener for privacy information.

A team of technicians has been dispatched to inspect Sydney's sprawling tollway tunnels after cracks recently appeared in the roof of the M4. 7NEWS went along for the ride as tollway owner Transurban insists the underground network is safe.See <a href="https://omnystudio.com/listener" rel="noopener noreferrer">omnystudio.com/listener</a> for privacy information.See <a href="https://omnystudio.com/listener" rel="noopener noreferrer">omnystudio.com/listener</a> for privacy information.

Technicians inspect M4 tunnel after cracks discovered in roof

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Technicians inspect M4 tunnel after cracks discovered in roof

Technicians inspect M4 tunnel after cracks discovered in roof