The short lines cut into the asphalt that you are referring to in your lane that run in the same direction of travel were a (silly) experiment by WSDOT to improve drainage. You can see them on I-90 as well, they’re particularly bad heading eastbound as you go up and over Snoqualmie pass and down the other side in the old sections that haven’t been re-paved in a while. I don’t think they’re especially effective at improving drainage or avoiding hydroplaning, and I think WSDOT has given up on using them in new paving jobs. I always avoid lanes with them - they’re loud when you’re driving on ‘em and it can jerk your car around unexpectedly.
mikeroute t1_j3pe4a4 wrote
Reply to I've driven up and down I-5 100 times since 2014. here's some fun facts about to know by KanyeWaste69
The short lines cut into the asphalt that you are referring to in your lane that run in the same direction of travel were a (silly) experiment by WSDOT to improve drainage. You can see them on I-90 as well, they’re particularly bad heading eastbound as you go up and over Snoqualmie pass and down the other side in the old sections that haven’t been re-paved in a while. I don’t think they’re especially effective at improving drainage or avoiding hydroplaning, and I think WSDOT has given up on using them in new paving jobs. I always avoid lanes with them - they’re loud when you’re driving on ‘em and it can jerk your car around unexpectedly.