Hi astroalfa, thanks for the list! I'm sure there others as there always seems to be road works going on. One new highway I came across while out and about in the weekend was a new Gwangmyeong - Suwon Highway which opens at the end of this month.
Thanks for the info! I found out that it's part of Suwon – Munsan Expressway (#17). This expressway is planned to pass through Seoul. I think there are still many expressways which are planned in Sudogwon area.
Ah interesting. I definitely think so. Personally I haven't taken too much interest in the highway system but it's still interesting to see what routes are opening up as this also affects inter-city bus travel too.