About

The City Infinity logo which is a black square with the words "City Infinity"a the bottom in white along with four white footprints to the left and most of the outline of a spoked wheel in white on the right.

Designing for sustainable mobility.

Established in March 2017, City Infinity is a micro highway engineering and planning consultancy which can help you deliver sustainable mobility and better streets.

Take a look at our Projects page to see who we’ve been working with and the range of projects we have been helping with as well as the other consultants we collaborate with.

For more information or a discussion, please contact us.

Mark, a middle aged white male with a greying beard, short hair and glasses wearing a brown flowery shirt.

Mark Philpotts

BEng (Hons) CEng FICE FCIHT FIHE PISEP MTPS RegAT(IHE)

City Infinity became Mark’s full-time role in 2024 through which he provides bespoke sustainable mobility design and planning services. He has over 30-years of public and private sector civil engineering experience including traffic and highway engineering, maintenance, bridge management, development management, and consulting.

Sustainable mobility is Mark’s area of professional interest, especially those small-scale, local schemes which can make a big difference to how people move. He has extensive knowledge of design detail and how street features fit together, which often makes the difference between good and great schemes; it’s also key to ensuring designs are accessible and inclusive to as wide a range of people as possible.

Mark has extensive experience in project delivery and has been responsible for managing multi-million pound investment programmes. At the other end of the scale, he has developed an almost fanatical interest in design detail and how street features fit together, as it can often make the difference between a good and a great scheme; it’s also key to ensuring designs are accessible and inclusive to as wide a range of people as possible.

Mark believes in the power of designers experiencing the infrastructure they design and he has taken this to heart with his collection of cycles including a Christiania cargo-trike and an Arcade Cycles tandem, both of which have been a revelation in intimately understanding crossfalls, cambers, surfaces and turning circles. He is a member of the Beyond the Bicycle Coalition.

He is a proponent of getting out of the office to look at street layouts and places to watch how people interact with infrastructure, as it gives real insight into how design can support people’s mobility.

As well as releasing design guidance through City Infinity, Mark is the author of CIHT’s Designing for Walking, a contributor to CIHT’s Planning for Walking, a CIHT Technical Champion, and an ICE Knowledge Network member. He is a fellow of each of the Institution of Civil Engineers, the Chartered Institution of Highways & Transportation and the Institute of Highway Engineers. Mark is also a Practitioner member of the Institute of Sustainability and Environmental Professionals, a member of the Transport Planning Society, an associate member of the Society of Road Safety Auditors and a qualified street works supervisor. He also holds an IHE Professional Diploma in Active Travel.

Finally, Mark has also been writing on civil engineering and highway engineering as The Ranty Highwayman through his blog since 2012 and in Highways Magazine since 2014.

Mark out on an infrastructure safari around Scheveningen on the Dutch North Sea coast.

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