When should I use 4- and 6-lane two-way roads?

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I am having no luck with two-way roads. They seem to clog really easy, even with moderate traffic.
This shows a ring of 6-lane two-ways around an industrial zone, the traffic is already queueing up:
When I convert all the 6-lane roads into one-way roads, traffic seems to flow much better. However, I'm reluctant to do this for three reasons:
- If two-way roads are in the game, they must have some purpose, right?
- I can't ask my citizens if they are ok with the longer ways.
- Most of the cities I have lived in have a ring road around the city, but none of them was ever one-way. (Some of them have grass in the middle and so not on every intersection you can turn in a way that would cross the other direction.)
How/in what situations would I use big two-way roads?
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What is the meaning of four lane road?
adjective. (of a highway) having two lanes for traffic in each direction: a four-lane thruway. noun. Also four-lan\xb7er [fawr-ley-ner, fohr-]. a four-lane highway.What is a two way two lane road?
A two-lane two-way road is a single roadway with one lane travelling in each direction; it can be a number of road function types (refer to Table 2\u20112) and carry a range of traffic volumes.2/4/6 Lane Highway Rules || Everything about Different Road Markings || DrivingHub
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