The Swedish police suspect jihadis of stealing cars in Sweden or even taking out credit to buy them; two Swedish cars were recently found at the Turkish border.
"It's all about high-powered four-wheel drive cars that they use for rocket launchers, or carry people and equipment," Niclas Larsen, from Stockholm police's fraud department, told Sweden's TT news service.
"We have had cases where we suspect that people take out credit to buy cars in Sweden, and subsequently disappear, perhaps to the Middle East."
Terror researcher Magnus Ranstorp said that the practice has been going on for some time, encouraged by the porous border between Turkey and Syria.
"It is suspected that this has been going on for a while, and it was probably easier to get over by car when the border was open between Syria and Turkey," said Ranstorp.
"If you come down with a car, you get higher status. It is an important part of IS (Daesh) operations," said the expert.
The legislation will be implemented along with secret surveillance, phone tapping and telecommunications surveillance, in order to identify potential terrorists, Justice Minister Morgan Johansson told TT.
According to Dagens Nyheter, around 300 Swedish nationals are thought to have traveled to Iraq and Syria to fight for Daesh, about 120 of whom have returned to Sweden.