what it the most challenging engineering project you have taken part in

Question: what it the most challenging engineering project you have taken part in
- Keywords:
  challenge,
  project
Asked by micker to Andrew, Angela, Eleanor, Emma, Withdrawn on 5 Mar 2016. This question was also asked by Abby2001, 283mete27, murpster, Reality is an illusion.
- Andrew Pidgeon answered on 5 Mar 2016:
  
  I have recently just finished a massive project on the M1 J19.
  
  If you look at my profile some of the screen shots in 3d are from that design!
  
  Also have a look at the link below to see what the design is about.
  http://www.cbrd.co.uk/road-schemes/m1-j19-catthorpe/

Question: what it the most challenging engineering project you have taken part in