Spring migration lasts for 40 days -- from January 24 to March 3 -- when millions of people travel home for the Lunar New Year.
The world's largest annual human migration, some 2.9 billion trips are expected to be made during the period.
Biggest homecoming parties
Beijing and Shanghai have witnessed the highest departure numbers since the beginning of spring migration, followed by Shenzhen and Guangzhou -- all major cities with significant populations of migrant workers.
On February 3, most trips were made between Beijing and Shanghai.
But the Shenzhen to Chongqing and Shanghai to Chaohu (an ancient city in Hefei) routes have been the most popular over the last 11 days, according to the map.
Tourist attractions are graded by how crowded they are too.
The map shows that on the afternoon of February 3, Jing'an Temple in Shanghai was "very packed" (scoring 5 out of 5) while the National Museum of China in Beijing was rated "packed" (4/5).
Monitoring traffic jams
The most popular means of transportation during spring migration is still the automobile, with an estimated 2.48 billion trips made by car over the Lunar New Year period.
This year, the government's traffic management bureau partnered with Baidu to launch a pingan bobao (safety broadcast) map.
The new feature highlights road traffic conditions in big cities and along major highways across the country.
The 42-kilometer Suzhou section of Beijing-Shanghai Expressway has been experiencing the worst congestion.
A portion of the Nanjing-Luoyang Expressway in Nanjing City, however, recorded the slowest traffic in general, moving 17km/h on average.
The map also highlights spots affected by accidents and fog.