By the way, it is not so easy to enter the Crimean bridge
At the entrances there are stationary ST-6035 inspection radio-technical complexes of the Directorate of Departmental Security of the Russian Ministry of Transport. They are also check cars for explosives.
https://twitter.com/nexta_tv/status/1578658153239306240
Security may have the day off for Putin’s birthday?
Maybe it was a truck supposed to carry explosives but with a little extra detonator added to the load.