Poor design. If you were colour blind, that sign would be very confusing.

No it wouldn’t. That border shape only exists in red for prohibitions. Even if you were colour blind you could see the border. There is no other sign you could mix it up with.

The strikethrough is in use for a different purpose, to cancel a previous sign (i.e. end of the bike lane).

How would that 60 means 60 km to next town with the name.

If it meant that it would have the name of the town on it.