I really like this episode

We return to New Earth and revisit the same city as in Season 2, though this time a different part of the city and with a new threat in the motorway. The idea of being stuck in traffic forever is pretty terrifying on its own, and we get to see how different people handle it.

The Macra make their return in this episode. Though not as good as their original story, they do provide a neat action setpiece.

Martha stands up for herself at the end and demands that the Doctor explain himself properly which is nice