Head-on collision between bus and lorry in Brazil kills more than 20

The report

It is not yet clear what caused the two vehicles to crash into each other in the early hours of Wednesday morning

The impact

The significance lies in what happens next: BBC notes that responses are already forming.

The head backdrop

The landscape around head, collision, bus, lorry, brazil has been shifting for some time, and BBC places this development within that longer trajectory.

Where this fits in Signal Ledger

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Our head read

Signal Ledger reads this through the lens of head, collision, bus, lorry, brazil: It is not yet clear what caused the two vehicles to crash into each other in the early hours of Wednesday morning.