Once it isn't fun, do something else. If I ride into the city I have to either leave early or late, same with the return trip. I sat in stop and go and slow and go on the Norge once, not anymore. Why abuse the bike and myself. I bought a liquid cooled thin bike for that travel when I must.
When it get really warm, the cheapest eco box with a radio and AC is more comfortable than any bike crawling behind cars at exhaust level.