Snow disrupts Inverness flights and blocked A9 at Daviot
Snow has disrupted flights at Inverness Airport and also brought traffic to a standstill for a time on the A9 at Daviot in the Highlands.
Heavy snowfalls have also closed, or delayed the openings, of more than 30 schools in the Highlands.
Flights from Inverness to London Gatwick, Manchester and Stornoway were delayed due to the wintry conditions.
The A9 southbound at Daviot, south of Inverness, was blocked after a lorry lost traction on snow.
The A86 Kingussie to Newtonmore was also closed by an accident.
Travel on the A82 in the Highlands has been disrupted by weather-related incidents, including a bus going into a ditch near Invergarry. No-one was injured.
Police in Dumfries and Galloway said they received reports of 17 accidents in less than four hours after a spell of heavy snow swept across the region.
Most of the accidents were on the A74(M) but no-one was seriously hurt.
Police Scotland earlier issued a warning to drivers as a yellow weather alert took effect.
The "be aware" warning runs until 15:00 and covers much of western, southern and central Scotland and well as Tayside and Fife and Grampian and Highlands.
Heavy rain will turn into up to 15cm (6in) of snow and gales are also expected.
The Met Office warning stated: "A band of heavy rain will spread eastwards during Tuesday morning and early afternoon, quickly turning to snow on high level routes above 200 metres and to lower levels for a time before it clears.
"Accumulations of 5-10cm of snow are likely above 300 metres, much of this falling in a short period, with 15cm possible on the highest routes above 400 metres.
"At lower levels, amounts will be much more variable with a few cm possible in some places while others will just see sleet and rain."
Road conditions are expected to be hazardous.
Drivers should expect restrictions to be in place on bridges, particularly the Skye bridge, and disruptions to ferry routes are also likely.
Some sections of the M74 and higher routes heading north out of the central belt are at risk of snow accumulations.
Standing water and spray will also make driving conditions difficult.
Ch Supt Stewart Carle, Head of Road Policing, said: "Drivers should take extra care while travelling on Tuesday.
"You should ensure you and your vehicle are adequately prepared for the conditions, making sure you have sufficient fuel and supplies such as warm clothing, food and water in the event you are delayed for several hours."
Heavy snowfalls and high winds have also heightened the risk of avalanches on Scotland's mountains.
The Scottish Avalanche Information Service has rated the potential for avalanches in Glen Coe as "high", the organisation's highest rating.
The risk in the Northern and Southern Cairngorms, Creag Meagaidh, Lochaber and Torridon has been rated as "considerable".