See : sodium-potassium pump where the transport ratio would be.
2.
A similar expression exists that includes ( the absolute value of the transport ratio ).
3.
During 2003 a total of 1.4 billion people travelled by BKV . During the Socialist era, Budapest had 2 million residents and its public vs . private transport ratio ( the so-called modal split ) was 80 % : 20 % in favor of mass transit.