What is the missing number?

A truck brimming with Worcestershire sauce meanders through the quaint Welsh town of Llanfairpwllgwyngyll, Anglesey, en route to Rhosllannerchrugog in Wrexham. Unexpectedly, it collides with a Nissan Qashqai.

Veering uncontrollably, the truck subsequently smashes into a car from Llanfihangel Tre’r Beirdd, injuring two otorhinolaryngologists inside. As one, already grappling with Schistosomiasis, succumbs to a myocardial infarction, an bystander, dialing emergency services on his Huawei, hastily reports the chaotic scene. The dispatcher inquires, "Can you tell me what happened?"

He responds, "It's hard to say."