Radar displays are not going to accurately display a displacement of 150m. They're set up for broader area surveillance.

Edit: here's a good example of a terminal radar display. The two parallel diagonal lines are the extended centerlines of two runways that are about 1570m apart (Athens airport, LGAV).

https://www.hvacc.gr/site/images/content/events/2003/athens-...

And that's the spacing between the runways. There is less space between the runway and the taxiway.

http://flightaware.com/resources/airport/SFO/APD/AIRPORT+DIA...