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The participants — a handful of dads — begin sharing personal stories about toddlers that melt down like snow on summer asphalt, frayed patience and what it means to parent with intention.

Both were handcuffed and led away, their feet dragging across asphalt covered in shattered glass and spent rubber bullets.

The drivers were led away by police, their feet dragging across asphalt lined with shattered glass and spent rubber bullets.

At takeover events, racers and spectators rush to an intersection and block traffic, while motorists perform stunts in a small space with little room between the asphalt they’re skidding across and the audience itself.

Among the reasons it’s challenging to collect, experts say, is that L.A.’s urban landscape bakes in the sun, heating up the asphalt, which could degrade ancient DNA buried underneath.