- A12 detour for Bodegraven/Leiden/Alphen a/d Rijn

- N11 direction Alphen a/d Rijn (around 9 km)

- Turn left at the traffic lights before the hoisting bridge and cross the railway

- Turn left after the railway on N11

- Turn left at the second traffic lights ( Molenwetering industrial area)

- Turn right after the first traffic lights (now you are on the way to A. van Leeuwenhoekweg)

- About 200 m farther you will see the KHZ building at No.50

- A4, detour Zoeterwoude Rijndijk

- N11 direction Alphen a/d Rijn

- Turn left at the third traffic lights (about 4 km farther) close to the Molenwetering industrial area

- Turn right after the first traffic lights (now you are on your way to Leuwenhoekweg)

- About 200 m farther you will see the kHz building at No.50