Darkness and Light: Part 1 - S1-E11
Other mistake: When Doc Samson attacks the convoy, he begins by bursting his hands out of the asphalt. This is pretty illogical, as for him to be able to wait for the convoy to reach him and then break his hands through the asphalt at the right moment would mean he would have to be inside the road itself, which means there would have to be a void between the layer of asphalt and the surface beneath it large enough for a person to fit inside, which would be a hazard, as the weight of cars passing over would eventually cause this section of the street to collapse.