From ‘manspreading’ to a public grooming ban, tell us about the dos and don’t of your daily commute

What are the unspoken rules of using public transport in your city?

Commuting through a city is stressful enough without other people breaking the unwritten codes of public travel and getting in your way. But the rules aren’t the same everywhere, and trying to figure out where to stand or when to give up your seat can take some guessing if you’re new to a city.

In Toronto, the city authorities are clamping down on rule-breakers in a new social media campaign encouraging travellers to document transgressions by their fellow travellers, like riding the train without shoes...

Jessica Lewis (@papertraildiary) Big fat NOPE #ttc pic.twitter.com/1pGRaO8GYp

In Spain, “El manspreading” became such a problem in Madrid that authorities unveiled new signs encouraging men to close their legs and respect boundaries on public transport.

In New York, the transit authorities have been forced to discourage people from doing their makeup and grooming themselves in public, and have banned all dogs – unless they can be carried in a bag.

Spectrum SINO Radio (@SINOinUK) #NewYork subway ban dogs on board unless.... they are in bags ! This is new #fashion! Tell us what you think @SINOinUK ! pic.twitter.com/DYPQvVZhMD

As part of our focus on public transport in cities, we want to hear about the cardinal sins of using public transport in your city: what are the cardinal sins of public travel where you live, and what etiquette would you like to promote on the public transport network in your city?

Add your contributions using the form below and we’ll use some in our ongoing coverage.

Follow Guardian Cities on Twitter and Facebook to join the discussion, and explore our archive here