Why are old road names used for new roads when the old roads still exist?

In Vancouver - well, in a suburb way outside of Vancouver, but kind-of attached - is Dewdney Trunk Road. A few blocks away there is another Dewdney Trunk Road. They both go in the same general direction, but one of them gets lost in the middle of a field and suddenly becomes 132 Avenue - and the other one starts where the first one ends off - but about 13 blocks south of it on what would be 119 Avenue if they had stuck to numbers! What vintage of BC Bud were the city planners smoking when they named these streets?

And Google Maps will give you a meandering route that uses both of the Dewdney Trunk Roads liberally to get to Golden Ears Provincial Park in Maple Ridge and waste a lot of gas and time doing it.

According to the early morning traffic news, Dewdney Trunk Road is a very important road that broadcasters keep their eye on when giving their audience advice on roads to take. But which one are they talking about?

"Well, everyone knows that one's the old Dewdney Trunk Road, and the other is the new one." Yeah, that helps. Did anyone ever consider naming one of them "old" or "new". Or better yet, there are 26 letters in the alphabet, if you put a single ounce of creativity into your life, you can use any combination of any of these 26 letters to create a new name for a new road!!! (They can't use the numbers because someone put the new road between 119 and 120 and there is no 119-and-a-half street. That was good planning too.)

Did anyone ever consider making the go lights green and the stop lights a different shade of green, just because everyone knows which one is which by their relative position on a set of traffic lights? Of course not!

Do city planners ever think that a person who hasn't lived somewhere for the past 40 years may want to travel through an area? Did they consider that naming a new road with the same name of a road about 13 blocks away might just be a tad confusing? Have they never heard of using new names for new roads?

The dearth of creativity in city planning is appalling.