Another example this morning of running the amber ending up obstructing crossing traffic: coach turning right out of Stevenson Drive onto Balgreen Road. Lights on Balgreen Road changed to red+amber as the coach was half way across Balgreen Road. Being a coach - and despite having breezed across its stop line with some alacrity - it clearly wasn't going to complete a sharp 90° turn at anything other than a sedate pace. But having effectively taken possession of the carriageway, the coach driver didn't seem to care that his misjudgement/impatience/illegal behaviour (delete as appropriate) was forcing everyone else to wait for him.
So in answer to the OP: random observation does indeed suggest that the majority of drivers fail to observe Highway Code rule 175.
(Just remembered another one, from last night: driver of small silver anonymous-looking hatchback type thing approaching the Haymarket junction along Dalry Road clearly accelerated when the light turned amber. Given that he/she was about to pass the turn in to Distillery Lane at that point this was always a rather optimistic choice of action, and sure enough the vehicle ended up sailing through the red light doing at least 35mph. Bear in mind that this was at 6pm when it was literally freezing cold and the braking performance of their vehicle, had their impetuous behaviour have required them to make use of it, would likely have been noticeably impaired.)