Land Rover 1
Our Client A1 Automotive contacted us concerning a proposed new commercial project in North London due for planning. The Client / developer was planning to construct a four-storey building with an additional lower ground floor and lies on an intersection of public highway so may affect adjacent vehicles and the drivers if there is any significant glare or reflections from the building onto the adjacent highway. There are proposed two number 19m spans of single storey glazing from ground floor and two number 18m spans of double storey glazing from second to roof alone each of the road facing elevations. Glazing can be a source of glare in the built environment.

The design information provided described glass elements that may create potential reflections from the facade under certain conditions upon the vehicle drivers with the potential to affect the operational highway in the vicinity.


The risk of glare to vehicle drivers could be created from reflections from the glass and cladding elements affecting the adjacent highway and could affect the ability to read traffic signals, other vehicles, cyclists and pedestrians without interruption or distraction.

We approached this complex problem by engaging our Partners, Arup, and using a software-based methodology we adopted for the rail industry that was endorsed and seen as best practice and trialled it for this highway issue to identify the level of risk.


Using data gathered from an initial desktop study, a 360-degree sun path analysis showing the buildings at each solstice / equinox and surrounded track in the vicinity was produced. This would ascertain the extent of the façade surface that may create sunlight reflections onto track (if any) and establish the extent of drivers views that may be affected commencing with the modelling of the winter and summer solstice (highest and lowest points of the sun) and certain points in between.

The creation of a Radiance software 3D sunlight simulation model based on the Architect’s 3D model and Highway alignment data was created and tested successfully.