One estimate says China will have 100 million vehicles by 2020 . Short supply of crucial car parts has caused some brands , including Toyota , to temporarily half production due to shortages . Chevrolet , Chevy , Ford and Citroen are among brands showing in Shanghai this week . ` ` 20 percent growth will last for several years , '' says Peugeot 's top executive . Supply - chain concerns loom after Japan 's devastating earthquake and tsunami .
One estimate says China will have 100 million vehicles by 2020 . Chevrolet , Chevy , Ford and Citroen are among brands showing in Shanghai this week . ` ` 20 percent growth will last for several years , '' says Peugeot 's top executive . Supply - chain concerns loom after Japan 's devastating earthquake and tsunami .