An interesting experience
After visiting the impressive engine room, our guide told us that Tower Bridge would soon open. When boats need to pass the bridge, but they are too large to go under, they need to inform the administration with 24 hours' notice. Passage for the boats is free. In general, the bridge rises just enough to let the boat through, and is only lifted to its full extension out of respect for the royal family or, for example, when the body of Winston Churchill was brought to London for his state funeral. The bridge raises in less than 30 seconds, and traffic is stopped for 5 minutes while the bridge lifts,