Trip generation for older persons and care housing

Applying general residential trip rates to an older persons scheme produces a transport case that nobody believes. Older persons housing trip rates are lower in the commuter peaks, higher in the middle of the day, and shaped by staff shifts and visitors rather than by school runs and journeys to work. Get the land use category wrong in the trip rate database and everything downstream is wrong with it, including the parking provision and the junction capacity work.

The first decision is not about trip rates at all. It is about which type of accommodation is being proposed, because the answer determines the use class, the comparison sites and the parking standard.

Why standard residential rates mislead

A conventional dwelling generates a morning outbound peak and an evening inbound peak driven by employment and education. Neither applies to a scheme occupied by retired residents, most of whom are not travelling to work and many of whom no longer drive.

What replaces those peaks is different in shape and timing. Staff arrivals and departures cluster at shift changes. Visitors arrive in the afternoon and at weekends. Deliveries, domiciliary care workers, pharmacy and laundry rounds and patient transport spread across the working day.

The practical consequence is that a scheme can generate very few vehicle movements in the network peak hour while generating real parking demand at 3pm on a Sunday. A transport case that only reports the network peak will understate the parking issue and overstate the highway issue at the same time.

Distinguishing the accommodation types

Four categories cover most schemes, and they are treated differently.

The C2 and C3 distinction is not a technicality. It affects the parking standard applied, the affordable housing position, the levy liability and the comparison sites available in the trip rate database. Where the care model sits between the two, set out the care hours per resident and the tenure arrangement, and expect the authority to test the classification.

Getting the trip rate selection right

Use the national trip rate database and document the selection, because the selection is what an officer or a highway authority will challenge. State the land use category chosen, the geographical filter, the survey date range, the site size range and the number of sites in the sample.

Three selection errors recur. Mixing care home surveys with retirement flat surveys to increase the sample size, which averages two different operations into a meaningless rate. Using a sample of urban sites for a scheme on the edge of a market town with no bus service. And relying on surveys old enough to predate current care staffing models.

Where the sample is small, say so and support it with a survey of a comparable operating scheme. Operators will usually provide staff rotas, resident car ownership figures and visitor logs for an existing site, and that primary evidence carries more weight than a larger but less relevant database sample. Present it in the Transport Assessment as a cross-check rather than as a replacement.

Staff shift patterns and their peaks

Shift changes are the defining feature of a care scheme. A typical pattern has an early shift starting before the network morning peak, a late shift starting in the afternoon, and a night shift starting in the evening, with a handover overlap at each change.

The overlap is what drives parking. For 30 to 60 minutes at each change, both shifts are on site, so the staff parking requirement is roughly the sum of two shifts rather than one. A design based on the number of staff on duty will run short twice a day, every day.

Ask the operator for the actual rota, including agency cover and the number of staff who arrive by car on a night shift when public transport is not running. Night shift staff drive far more often than day staff, and that is the number the highway authority will ask about if you leave it out.

Visitor, care worker and delivery movements

Visitor demand peaks in the afternoon and at weekends, and it concentrates around events: family visits on Sunday, activities, religious services, medical appointments. A car park sized on a weekday average will overflow onto the street on a Sunday afternoon.

Domiciliary care workers serving an extra care scheme generate short-stay movements through the day, often in their own cars, with dwell times of 20 to 40 minutes. They need short-stay spaces near the entrance rather than distant long-stay bays.

Deliveries include food, laundry, clinical waste, pharmacy and maintenance. Patient transport and ambulances need a designated bay with a step-free route under cover to the entrance, and that bay must not be the same space the refuse vehicle reverses into.

Parking demand against occupier car ownership

Resident car ownership in older persons accommodation is substantially lower than in general housing, and it falls further as the care level rises. That justifies a reduced resident allocation, provided the reduction is evidenced rather than asserted.

Evidence that works:

1. Census car and van availability data for the relevant age band and area, cited with the year.
2. Car ownership data from an operating scheme of the same type run by the same operator.
3. A parking survey of the surrounding streets where overspill is the concern, which our note on running a parking stress survey that stands up covers.

Then reinvest the saving visibly. Mobility scooter stores with charging points, a taxi and minibus drop-off at the entrance, and a small number of flexible spaces that can serve staff, visitors or care workers at different times of day all read as design rather than as a reduction. A Parking Survey and a parking management plan together answer most objections, particularly where the plan allocates spaces by time of day rather than permanently.

Evidencing the rate to a sceptical officer

Highway officers have seen optimistic older persons transport assessments, so assume scepticism and structure the chapter for it.

Lead with the care model and the use class, then the trip rate selection with its filters, then the primary evidence from a comparable scheme, then the parking demand profile across a full week rather than a peak hour. Show Sunday afternoon. Show the shift overlap. Put the staff rota in an appendix.

Then offer a mechanism. A parking management plan secured by condition, with monitoring after 12 months of occupation and an agreed remedy if demand exceeds the provision, converts a disagreement about a number into a manageable risk. The monitoring commitments belong in the Travel Plan, and they should be capable of being measured on a site where residents do not commute.

One honest uncertainty. Trip rate samples for extra care are thinner than for care homes and general housing, and care models are changing faster than the survey data. That is an argument for primary evidence from an operating scheme, not for wider filters on the database.

This is general guidance, not legal advice. Councils expect transport evidence from a suitably qualified transport planner, and professional review is strongly advised. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.