Repair constructions will be implemented on major highway roads where traffic congestion will be unavoidable due to traffic regulation. (The roads will not completely be closed, but only a single lane is kept for traffic.)
Those who use highways should be kept updated with their construction schedule. If you plan to take an express bus on your trip, it is better to consider a delay in arrival.
Highway Renewal Project by Nippon Expressway Company Limited (Nexco)
West Japan Construction Schedule (by West Nexco) *Japanese web site
Central Japan Construction Schedule (by Central Nexco) *Japanese website
East Japan Construction Schedule (by East Nexco) *Japanese website