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- Weekend and public holidays 07:00 am - 12:00 pm and from 3:00 pm - 8:00 pm Nighttime asphalt maintenance N9 and N99 July 27 - August 1 Rijkswaterstaat will carry out maintenance on the asphalt of the N9 and N99 over five nights. Between Monday, July 27 and Saturday, August 1, work will take place on the N9 for three nights and on the N99 for two nights. Traffic will be diverted and motorists should expect extra travel time of 10 to 30 minutes. Closures N9, between Den Helder and the Stolperbascule bridge: - Monday, July 27, 9:00 PM to Tuesday, July 28, 5:00 AM - Tuesday, July 28, 9:00 PM to Wednesday, July 29, 5:00 AM - Wednesday, July 29, 9:00 PM to Thursday, July 30, 5:00 AM Traffic will be diverted in both directions via the N99, N249, and N248 during these nights. N99, between Van Ewijcksluis roundabout and the A7 junction, Den Oever. - Thursday, July 30, 10:00 PM to Friday, July 31, 5:00 AM - Friday, July 31, 10:00 PM to Saturday, August 1, 5:00 AM.