Speed evidence and an access refused against advice: the Rose Farm appeal.

The appeal

The housing site is allocated under policy RD1 of Halton Borough Council's Delivery and Allocations Local Plan, and Halton had resolved to grant permission for the housing. The access onto Chapel Lane lies within Knowsley, so a separate application was made there (decision, paragraphs 5 to 7). Neither highway authority raised a technical objection, subject to mitigation and conditions (paragraph 8). The single main issue was whether the access would pose an unacceptable risk to existing highway users (paragraph 9).

Chapel Lane is a 30 mph C-class road carrying about 4,965 vehicles on a typical weekday, with a pronounced reverse bend just north of the access (paragraphs 16 to 18). The development was forecast to add about 40% to morning peak traffic and 53% to evening peak traffic on the lane (paragraph 19).

How the inspector framed the question

The inspector began with the test. The question was not whether existing conditions were ideal, but whether the proposal would give rise to unacceptable consequences, taking account of mitigation (paragraph 11). A road that is narrow or experiences speeding is not, of itself, a reason to refuse further development served by it: in the inspector's words, "sub-optimal does not mean unacceptable" (paragraph 12).

Existing conditions were therefore the baseline, and the development could not be expected to remedy deficiencies that would exist anyway. The assessment was to identify the change arising from the proposal, considering movements, access design and visibility, collisions, the character of the lane and mitigation together rather than treating any single factor as decisive (paragraph 13). Residents' experience was relevant, but had to be weighed alongside the speed surveys, collision records, visibility measurements and trip forecasts (paragraph 14). The highway authorities' views were important but not determinative (paragraph 15).

The speed and visibility evidence

Speed surveys by both the council and the appellant since 2022 recorded 85th percentile speeds of 33 to 38 mph. The inspector preferred the appellant's surveys, taken close to the site, to the council's slightly higher readings from locations further north, which were found less representative of speeds at the access. Speeds reduced on the approach to the bend (paragraph 21).

Some drivers exceeding 30 mph was not unusual and did not, of itself, show an inherent safety problem; the absence of any discernible pattern of injury collisions supported that view (paragraph 22). What mattered was that the junction had been assessed using observed traffic conditions, and the splays had been designed having regard to prevailing speeds. The splays, 2.4 by 52 metres to the north and 2.4 by 54 metres to the south, were secured by condition 4, kept clear of anything above 600 millimetres. An agreed traffic calming scheme was expected to reduce speeds by about 1 to 3 mph (paragraph 23).

The inspector also walked the footway and found its pinch points did not make the route unsafe for the modest increase in pedestrians, with alternative routes and improvements available (paragraphs 24 to 27). The access was found safe and suitable, and in accordance with Knowsley Core Strategy policies CS2, CS7 and CS19 (paragraphs 28 and 29).

The costs decision

The council argued that there was evidence of an existing speeding problem, that members had seen the lane for themselves, and that it was a matter of judgement whether an undefined traffic calming scheme would work (costs decision, paragraphs 12 to 16).

The inspector accepted that members are not bound by officer advice, but said that a contrary view should rest on sound planning grounds and substantive evidence (paragraph 28). Recorded speeds above the limit did not show that the access would be unsafe: the splays could be achieved even using the council's higher speed figures, and the council produced no competing technical evidence (paragraph 30). Local knowledge and personal observation, however genuinely held, were "no substitute for objective analysis and proper evidence" (paragraph 32). The council did not rebut the appellant's surveys, visibility calculations or road safety audit during the appeal (paragraph 33), and the committee minutes recorded none of the members' reasons (paragraph 34).

The concerns could also have been dealt with by condition (paragraph 35). A full award was made on the substantive grounds. The council's engagement on the statement of common ground was found to be slower than it ought to have been, but not to have caused significant wasted expense, so the procedural grounds did not justify an award on their own (paragraphs 38 to 42).

Points of interest and doubt

The weight given to survey location is the most transferable point. Speeds were higher further north. The decision does not suggest the council's figures were inaccurate, only that they were less representative of conditions at the access. The inspector also found that the splays worked on the higher figures, so the choice between surveys was not ultimately decisive. A case where the splay only works on the lower figure would be harder.

The council's position, that it could not be sure an undefined traffic calming scheme would succeed, is not without force. The inspector's answer was that the access did not depend on it: the splays were designed to observed speeds, and the 1 to 3 mph reduction was an additional benefit. That is our reading of paragraphs 23 and 30 together, rather than a finding stated in those terms.

The decisions do not establish that members must follow highway officers. They show that a refusal on highway safety grounds against technical advice needs its own technical evidence at appeal.

Practical points

• Survey close to the access. The inspector preferred surveys taken near the site because they represented the speeds that the splay must serve.
• Test the splay on the higher speeds. Showing that the splay works on the objectors' figures as well as your own removes a point of dispute.
• Keep the splay independent of mitigation where possible, so that traffic calming is a benefit rather than a precondition.
• Put the collision record and the road safety audit before the inspector, alongside the speed and visibility evidence.
• Consider costs where a refusal against technical advice is not supported by evidence.