Rescuers have been struggling with the operation as the hole -- now the length of an Olympic swimming pool -- expands since opening up on Tuesday in Yashio city, on the outskirts of Tokyo.
Rescuers will use the 30-metre (98-foot) slope to send heavy equipment into the hole.
Soil and debris covering the cabin of the 74-year-old driver have prevented any communication with him since midday on Tuesday.
With the walls of the hole -- around 15 metres deep, according to NHK -- eroding, rescue workers are unable to stay inside it for long.
Heavy chunks of asphalt have fallen inside, making it difficult for rescue workers and heavy machinery to go near the chasm.
Around 2,600 cases of road sinkholes in 2022 were caused by sewer pipes, according to local media. Most were small, at only 50 centimetres deep or less.
No one was hurt and the street reopened a week after workers toiled around the clock.
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