根据IIHS的测试规范
车顶只能承受2.7倍车重只能在 Roof strength项目 拿个 Marginal
以下是IIHS对车顶承重的测试及建议
In the test, the strength of the roof is determined by pushing a metal plate
against one side of it at a slow but constant speed. The force applied
relative to the vehicle's weight is known as the strength-to-weight ratio.
This graph shows how the ratio varied as the test of this vehicle progressed.
The peak strength-to-weight ratio recorded at any time before the roof is
crushed 5 inches is the key measurement of roof strength.
A good rating requires a strength-to-weight ratio of at least 4. In other
words, the roof must withstand a force of at least 4 times the vehicle's
weight before the plate crushes the roof by 5 inches. For an acceptable
rating, the minimum required strength-to-weight ratio is 3.25. For a marginal
rating, it is 2.5. Anything lower than that is poor.
简单说，一般来说车顶能承受4倍自身车重才是一台好车该有的能力
看大部分的测试结果，拿 Good 的车种大概都在5倍自身车重以上
http://www.iihs.org/iihs/ratings/vehicle/v/toyota/corolla
连很烂的美国神A都能承受自身车重5倍有余，癌董请再加油好吗？
http://www.iihs.org/iihs/ratings/vehicle/v/ford/focus-4-door
本版神车Focus也是承受自身车重5倍有余，癌董请再加油好吗？
要就大器一点拿个五倍车重出来让大家赞叹一下，弄个三倍左右只是自取其辱
※ 引述《eu1201 (肥宝)》之铭言：
: 图文好读区: http://yo99306005.pixnet.net/blog/post/40429489
: 这场简单大胆的实验，展现了LUXGEN在车辆设计上，除了重视科技安全配备的全面防护能
: 力之外，最基础的车体安全结构上也毫不马虎，S5 TURBO增加ABC柱钢材厚度及补强片、
: 使用B柱扇形结构与分离式溃缩盒设计、采Tailored Blank不等厚材技术、强化车侧防护
: 钢梁结构；车门内设有高达1470MPa之超高强度防撞梁，保护乘员侧撞时之安全，底板大
: 梁采用与欧洲高级车同等级之980MPa高张力钢板，确保前撞时座舱完整性、三段式能量传
: 导机制提供超高安全系数、车顶挤压roof crash测试符合美规FMVSS (Federal Motor
: Vehicle Safety Standards)法规，运用电脑辅助工程CAE(Computer Aided Engineering)
: 分析约可承受2.7倍车重之挤压。 LUXGEN以行动证明，S5 TURBO给全家人最安全的防护，
: 更是购车最佳选择！
: