<p>In those cities in which public transportation is adequate, fewer traffic problems occur and pedestrians are rarely involved in accidents.</p>
<p>Can someone explain why it's IN WHICH? and not WHERE? I don't know. Where sounds better in my opinion.</p>
<p>In those cities WHERE public transportation is adequate .... in which sounds, i don't know .. messy?</p>
<p>‘Where’ might sound better, but ‘in which’ is still grammatically correct, which is all that matters on the SAT.</p>
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<p>Okay. When you are saying “in those cities”, you are already answering the question “where?”. Where would be redundant. Look at it this way. Would it make sense to say “in that location, where…”. Well, you’re repeating the same thing twice. “In those cities” explains the where, and “public transportation is adequate” is the condition. When relating the two things, you need an “in which”.</p>