(CNN) If you commute to work and your train is often delayed, you might feel a sense of amusement looking at this "rail delay scarf."

Knitted by a German woman after an often-delayed 40-minute commute to work in Munich, the scarf features a color for various lengths of delay: dark gray for up to five minutes late, light pink for five to 30 minutes and bright red for more than 30 minutes late one-way. Each row corresponds to one commute, with two rows being one day.

The woman's daughter, journalist Sara Weber, shared her mother's workpiece on Twitter, where it went viral.

Meine Mutter ist Pendlerin im Münchner Umland. Und begeisterte Strickerin. 2018 hat sie einen "Bahn-Verspätungsschal" gestrickt. Pro Tag zwei Reihen: Grau bei unter 5 Minuten, rosa bei 5 bis 30 Minuten Verspätung, rot bei Verspätung auf beiden Fahrten oder einmal über 30 Minuten. pic.twitter.com/PpGJiiU8AS — Sara Weber (@sara__weber) January 6, 2019

"She takes a regional train and then the subway, which normally takes 40 minutes," Weber told CNN. "Because there are so often delays, she decided to make them visible by knitting a scarf."

So, for the whole of 2018 the woman knitted, tracking all her commutes. And she's still keeping at it for 2019, Weber said.

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