What is the reason why travel information cannot be found in traffic big data?

The reasons why travel information cannot be found in big data are as follows:

1. In the past 14 days, there was not enough valid data for users to stay in the call. Users need to record the call data of a city with the earliest and latest interval of more than 4 hours in recent 14 days before displaying the itinerary.

2. Users of China Telecom, China Mobile and China Unicom can use the travel card service. Users with new accounts can only use this service after 14 days.

3. There is an error in the travel card data.