对于轻微的限制违规行为, M4 的速度监控系统会发出罚款. M4 speed cameras issue fines for minor limit violations.

威尔特郡和斯温登的M4高速公路上的速度监控仪已经导致超过临时限量的司机被罚款,甚至处以失资. Speed cameras on the M4 in Wiltshire and Swindon have led to fines and disqualifications for drivers exceeding temporary limits, even by a few miles per hour. 对于交通拥堵或道路工程而言,可变速度减速自动执行,从而获得罚点. Variable speed reductions for congestion or roadworks are enforced automatically, resulting in penalty points. 政府最近的一项审查发现, 一些摄像机可能已经执行过时的限制,导致可能退款或点删除. A recent government review found some cameras may have enforced outdated limits, leading to possible refunds or point removals.