This guy has the moment of the explosion. On the road deck with fire reaching up to the rail track above and to the left.
His second embedded video, watch the far truck on the right.
Peringatan Konten Sensitif
I'm no explosive expert, but the explosion appears to be horizintal, rising vertically upwards.
"According to the first conclusions of the investigation, the Crimean bridge was attacked using a truck packed with explosives. Under the explosion, 4 spans of the automobile bridge collapsed and several tank wagons of the train which was travelling overhead were set on fire. The repairs will take at least 1 month and a ferry is already in place to ensure the continuity of traffic."