Yes, 'manja', the thread used to fly kites. That thing is very deadly.
If you travel by a four wheeler, then there's no problem. But if you are a two wheeler rider and you live in India, there is a serious cause of concern.
These days many people or children fly kites on road. And if you are travelling on a two wheeler and you come across a kite thread, you are bound to get sharp cuts anywhere on your body. Every year there are news of people who were injured in such type of incidents. I had read news about people's throat being slit open.
So, BE CAREFUL.
The only thing you can do to prevent such type of incidents is to remain at home and enjoy kite flying on the terrace of your house. Avoid passing from slum areas, as these are the areas where people are least cared about other peoples' safety. Always wear a helmet when you drive which can protect your face if unfortunately you come across the kite thread.
Have a safe and happy Makar Sankranti and Pongal.
In Marathi they say, "तीळ गुळ खा अणि गोड गोड बोला."
That means, "Eat linseed mixed with jaggery and utter good and sweet". (I probably translated it wrongly).