More severe low-tech solution: https://maps.google.co.uk/maps?q=blackwall+tunnel&hl=en&ll=51.496467,0.002017&spn=0.003841,0.009645&client=firefox-a&hnear=Blackw

More severe low-tech solution: https://maps.google.co.uk/maps?q=blackwall+tunnel&hl=en&ll=51.496467,0.002017&spn=0.003841,0.009645&client=firefox-a&hnear=Blackwall+Tunnel,+London,+United+Kingdom&t=h&z=17&layer=c&cbll=51.496422,0.002184&panoid=PxV8zQOysXqalADtmkbjSA&cbp=12,359.88,,0,-2.48 https://maps.google.co.uk/maps?q=blackwall+tunnel&hl=en&... (Blackwall Tunnel, northbound, London) And again, just in case you missed the scraping sounds the first time: https://maps.google.co.uk/maps?q=blackwall+tunnel&hl=en&ll=51.498531,0.001545&spn=0.00384,0.009645&client=firefox-a&hnear=Blackwall+Tunnel,+London,+United+Kingdom&t=h&z=17&layer=c&cbll=51.498663,0.001526&panoid=1CoD-kL0V2llH65kjm_5Pw&cbp=12,359.68,,0,-2.48 https://maps.google.co.uk/maps?q=blackwall+tunnel&hl=en&... (For some reason they don't appear to have anything similar going south...)