According to the MTA, 4.5 million people use the subway every day. This is astonishing as the population of NYC is estimated to be around 9 million. This means there is high reliance on the subway, but also it serves as an excellent medium to communicate with a large number of people.
Personally I feel MTA does a great job. The figures are simple and clear. Riders aren’t distracted by the messenger as they use colorful cartoon figures. Having this an option to communicate to such a large number of people is vital to public health professionals the ability to disseminate information to people quickly.
Here are a few more examples. You can see its well designed, has simple messaging. Even though the figures can be understood to people with varying English proficiency, these signs are great because they include multiple languages when they include additional information. The hoverboard example is a personal favorite.