I thought I'd start up a new thread given the specific subject.
Let's start off by discussing Hampshire's policy towards illuminating motorway junctions. I struggle to make sense of the policy that was applied in the past when the motorways and junctions were first constructed. In general Hampshire had a policy of keeping motorway junctions unlit, and a lot of this can still be seen to this day. However, some junctions have been lit from the outset, and on the face of things it is difficult understanding why some favoured lighting when other seemingly more important junctions did not. So, here's a bit of a list:
M3
J4a (circa. 1992), HDC - lit since construction (originally Philips SGS203) J5 (1971), HDC - unlit since construction J6 (1971), BDBC - unlit since construction J7 (1971), BDBC - unlit since construction J8 (1971), BDBC - unlit since construction J9 (1985), WCC - unlit since construction J10 (1994), WCC - unlit since construction J11 (1994), WCC - partially lit since construction (originally Philips SGS204) J12 (1991), EBC - lit since construction (originally Philips MA60) J13 (1967/91), EBC - road through junction lit prior to motorway or predecessor J14 (1975/91), EBC - originally unlit, lit since A33-M3 motorway upgrade (originally Philips MA60)
M27
J1 (1975), NFDC- unlit since construction J2 (1975), NFDC - unlit since construction J3 (1975), TVDC - originally unlit, lit since circa. late 1980s (originally Philips MA60) J4 (1975/84), TVDC - originally unlit, partially lit in late 1980s (originally GEC Z8536), fully lit circa. 1994 (Urbis ZX4) J5 (1983), EBC - originally unlit, lit since circa. 1986) J7 (1978), EBC - lit since construction (originally GEC Z9554M) J8 (1975), EBC - lit since construction (originally Philips MA5) J9 (1975), WCC - originally unlit, lit since circa. 1985) J10 (1976), FBC - lit since construction (originally Philips MA60) J11 (1976), FBC - lit since construction (originally Philips MA50) J12 (1976), PCC - lit since construction (originally Philips MA60)
M271
J1 (1975), TVDC - unlit since construction
A3(M)
J1 (1979), EHDC - lit since construction (originally Philips MA90) J2 (1979), EHDC - unlit since construction J3 (1979), HBC - unlit since construction J4 (1979), HBC - road through junction lit prior to motorway J5 (1979), HBC - road through junction lit prior to motorway or predecessor
Some patterns. None of the motorway junctions in New Forest District, Test Valley District or Basingstoke and Deane Borough were lit at the outset, and with the exception of a roundabout at M3 J11 none of the junctions in Winchester City Council's area were lit at the outset. However, Portsmouth's junctions (and motorways) and Fareham Borough's junctions were lit from the outset. In East Hampshire District and Havant Borough junctions have only been lit where junctions were built on existing roads rather than with new link roads. In Eastleigh Borough all but one junction have been lit from the outset. So, perhaps it was a local authority preference which explains how junctions connecting trunk roads ended up unlit whilst simple motorway spurs to the old road sometimes ended up lit.
The next question is how M27 J10 came to receive 12m columns and Philips MA60s whilst M27 J11 nearby only received 10m columns and Philips MA50s, even though the carriageway widths around J11 are typically wider and J11 is busier and has strategically been far more important since the M27 was completed in 1984.
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