>In first for car crash test you should trust Euro NCAP not US NCAP. Because your limits so low than Euro NCAP. Big cars seem people more safety. But that's not true.

This is the only difference I could find online describing the difference between the crash tests of the two organizations:

How do the crash tests differ between the Euro NCAP and US NCAP programmes?

In the Euro NCAP test only 40% of the vehicle width is impacted into a deformable barrier face, whereas in the US NCAP test 100% of the vehicle width is impacted into a flat rigid wall. The Euro NCAP test provides a more stringent test of the vehicle’s structure/bodyshell and is more representative of real world accidents.


http://www.euroncap.com/Content-Web-Faq/85a3359d-5410-487c-a6d0-e2d45491b21e/euro-ncap-in-the-world.aspx

I found this article very interesting:

http://www.safecarguide.com/exp/intro/idx.htm

It seems that it is a generally held view that the Euro NCAP tests are more stringent where safety matters.