According to the report, what caused the traffic delay this morning?

Good morning, commuters. This is YQN104 traffic report. On Highway 7 going south, traffic is moving slowly due to fog which is still heavy in some places. If you’re heading south, we recommend taking Highway 17 as an alternative route since foggy conditions have already cleared on this road. Remember that highway construction is scheduled to begin tomorrow along Highway 17 from Cherry Street up to the Delta Road exit. You may want to avoid that area for the next few weeks. Now, after our commercial break we will be with Robin for the sports updates. So please stay tuned.