Don't crash. Problem solved. lol
Easier said than done considering in its class it has mid or near the bottom
1. Horsepower and hence slower acceleration times
2. Drum brakes which may or may not be connected to long braking distance
3. Torsion beam rear (as opposed to independent) which may or may not help in agility
4. Lack of steering feel (subjective)
5. No other driving aids option like BSM, lane depature (could be wrong)
With that said, the Corolla perform well enough in the other iihs test to still get a top pick (just not a top pick+)
If I was Toyota and concerned for safety first thing I would do is make BSM standard and let the competitors folloiw.
Also
"During the 2014 Toyota Corolla's press launch, the automaker announced it had high expectations for safety test ratings of the redesigned Corolla, since it features a new driver's knee airbag and passenger-seat cushion airbag, which brought the total up to eight airbags. Toyota expected a Top Safety Pick+ rating, an executive said in a speech."
http://m.motortrend.com/wot/2014-toyota-corolla-rated-marginal-in-iihs-small-overlap-test-412863.html